Replace Steering Control Unit Wiring Harness Insulation - 2020 Mercedes-Benz GLC-Class

October 23, 2020 NHTSA CAMPAIGN NUMBER: 20V651000

Damaged Power Steering Control Unit Wiring Harness

A loss of power steering assist can increase the risk of a crash. Additionally, If the wiring harness short-circuits, there is an increased risk of a fire.

NHTSA Campaign Number: 20V651

Manufacturer Mercedes-Benz USA, LLC.

Components STEERING

Potential Number of Units Affected 2,535

Summary

Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2020 GLC300, GLC350e, GLC43 AMG, and GLC63 AMG vehicles. The power steering control unit wiring harness may have been damaged during the production process, possibly resulting in a loss of power steering assist or an electrical short-circuit.

Remedy

MBUSA will notify owners, and dealers will inspect the wiring harness, and replace it if necessary, free of charge. The recall is expected to begin December 22, 2020. Owners may contact MBUSA customer service at 1-800-367-6372.

Notes

Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.

Check if your Mercedes-Benz has a Recall

IMPORTANT RECALL CAMPAIGN UPDATE

Please see the attached documents related to the campaign listed above.

Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FOR-MERCEDES.

Sincerely,

Gregory Gunther

Department Manager, Vehicle Compliance & Analysis

A Mercedes-Benz AG Company

Campaign No. 2020110012, December 2020

Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year ("MY") 2020 GLC-Class (253 platform) vehicles, the power steering control unit wiring harness might have been damaged during the production process. A damaged wiring harness could lead to moisture ingress into the wiring harness and/or the power steering control unit, resulting in a loss of the power steering assist, which could increase the risk of a crash. In addition, a damaged wiring harness could result in a short circuit, which could increase the risk of a fire. An authorized Mercedes-Benz dealer will check the steering control unit wiring harness on the affected vehicles and replace it, if necessary.

Prior to performing this Recall Campaign:

• VMI must always be checked before performing campaigns to verify that the campaign is required on a specific vehicle. Always check for any other open campaigns, and perform accordingly.
• Please review the entire Recall Campaign bulletin and follow the repair procedure exactly as described.

Please note that Recall Campaigns do not expire and may also be performed on a vehicle with a vehicle status indicator.

Approximately 2533 vehicles are involved.

Order No. P-RC-2020110012

This bulletin has been created and maintained in accordance with MBUSA-SLP S423QH001, Document and Data Control, and MBUSA-SLP S424HH001, Control of Quality Records.

Check/test procedure

1. Switch off ignition and store vehicle key at least 2 meters away from vehicle.

2. Remove lower engine compartment lining.

For basic data for model 253, see AR61.20-P-1105LW;

3. Release and remove both connectors at steering control unit (figure 1).

4. Check connector of red power supply cable and brown ground cable for moisture.
   • In the case of moisture, make detailed photos, create the steering (N68) control unit log and clarify the further repair procedure via PTSS case.

5. Expose wiring harness up to a length of 300 mm from the connector. This can be achieved by sliding back the protective hose.
   • There are two different cable routings (figure 1).

Figure 1 (Routing in cable duct) - (Routing in protective hose)

In the case of routing in cable duct

1. 1. Release cable duct.
   2. Mark position of cable ties so that these are located at same position during the installation.
   3. Release cable ties (from the connector, the first four) and remove lines from cable duct.
   4. Slide back the protective hose for check purposes.

In the case of routing in the protective hose without cable duct

1. 1. Mark position of cable ties so that these are located at same position during the installation.
   2. Release cable ties (starting from the connector, the first two) and slide back the protective hose.

6. Check the red power supply cable and brown ground cable 300 mm up to 320 mm after the connector for cuts in the insulation (figure 2). Move the red power supply cable and brown ground cable in all directions for check purposes.

The red power supply cable and brown ground cable may not be damaged.

Figure 2 (NOT OK)

The following damage may be present.

1. Brown ground cable damaged: Perform work procedure A.
2. Red power supply cable or both cables damaged: Perform work procedure B.
3. Red power supply cable and brown ground cable not damaged: End measure.

The findings from the check/test procedure must be recorded in writing in the workshop order and then stored in a tamperproof manner.

Work procedure A

IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.

Replace brown ground line

• If such a damage exists so that the strands of the line can be seen, a quick test with connected steering must be performed.

If the fault code B210F00 is stored in the steering control unit (N68), this can be ignored during the evaluation. This fault code has nothing to do with the current topic.

• This fault code arises if the workshop removes the power connector of the steering and the steering is not yet in sleep mode and/or is in idle state.
• Solely in the case of the following two fault codes P063500 or C159800 in the steering control unit, a PTSS case must be created.

Create steering (N68) control unit log and clarify the further repair procedure via PTSS case.

If neither of the two indicated codes is stored, then only the brown ground line must be replaced.

If the protective covering is damaged but no strands of the line can yet be seen, a quick test is not necessary. The brown ground line must be replaced.

1. Dismount right front wheel.

2. Remove fender liner in front fender (AR88.10-P-1300LW).

3. Disconnect ground line at power connector at new and old wiring harness. The primary lock can be opened by moving the pink lug outwards  (figure 3).

4. Disconnect plug contact (figure 4).

Figure 3 - Figure 4

5. Open all cable ties at new wiring harness and remove both the FlexRay and the power supply line.

6. Unscrew cable lug of old ground line, cut off and wrap in fabric tape (figure 5).

Figure 5

7. Screw new ground line onto ground point, connect into existing power connector and route parallel to existing line.
   • In the case of routing in the protective hose, it must be ensured that the new ground line is also installed with the delivered protective hose.
   • In the case of routing in the cable duct, an identical routing to the previous wiring harness must be ensured.

8. Assemble in reverse order.

Work procedure B

IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.

Replace red power supply line

• If such a damage exists so that the strands of the line can be seen, a quick test with connected steering must be performed.

If the fault code B210F00 is stored in the steering control unit (N68), this can be ignored during the evaluation. This fault code has nothing to do with the current topic.

• This fault code arises if the workshop removes the power connector of the steering and the steering is not yet in sleep mode and/or is in idle state.
• Solely in the case of the following two fault codes P063500 or C159800 in the steering control unit a PTSS case must be created.

Create steering (N68) control unit log and clarify the further repair procedure via PTSS case.

If neither of the two indicated codes is stored, then only the red power supply line must be replaced.  If the protective covering is damaged but no strands of the line can yet be seen, a quick test is not necessary. The red power supply line must be replaced.

• In the case of damage to the red power supply line, the brown ground line is always also replaced.

1. Dismount right front wheel.

2. Remove fender liner in front fender (AR88.10-P-1300LW).

3. Unscrew ground line of steering (figure 5, see work procedure A)

4. Release all cable ties at cable duct in wheel arch and open cable duct (figure 6).

Figure 6

5. Remove cover over battery and remove filter housing (figure 7).

Figure 7

6. Disconnect the contacts of power supply cable (figure 8).

In vehicles with 12 V on-board electrical system

1. 1. Remove 12 V battery (AR54.10-P-0005LW).
   2. Release prefuse box F32/3, unclip cover and disconnect power supply cable of steering (connection 8) (figure 8).

Figure 8

In vehicles with 48 V on-board electrical system 

1. 1. Remove battery of 48 V on-board electrical system (AR54.10-P-0022LWO).
   2. Release prefuse box F32/3, unclip cover and disconnect power supply cable of steering (connection 8) (figure 8).

For basic data, see AR54.15-P-1330LW.

In the case of hybrid and all-electric vehicles

1. 1. Perform power disable for vehicle (AR47.70-P-1000EQ).
   2. Remove 12 V battery (AR54.10-P-0005LW).
   3. Release prefuse box F32/3 and disconnect the power supply cable of steering (connection 8) (figure 8).  For basic data, see 15-P-1330LW.

7. Cut off power supply cable of steering (connection 8) approx. 100 mm after cable lug.  Sharp edges that could cause potential chafe marks must be removed and insulated.

8. Release engine compartment seal and place to one side, and unclip cable boot (figure 9).

Figure 9 - Figure 10

9. Carefully open right cable boot (figure 10).
   • For this purpose, accordingly remove cable tie and fabric tape.
10. At the new wiring harness, release cable ties at protective hose and remove the FlexRay cable or cut off if necessary.

IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.

11. Position new wiring harness, starting from ground branch-off line in wheel arch, parallel to the existing wiring harness.
    • In the case of the branch-off line for the ground connection, ensure the correct position and route power supply cable along the existing wiring harness. Ensure a chafe mark-free routing!

12. Connect new line to prefuse box and tighten with 8 Nm. Fully wrap line by means of fabric tape, parallel to the existing wiring harness, up to the branch-off line of the ground cable in the existing wiring harness (figure 11). Ensure a chafe mark-free routing!

Figure 11

13. Close cable boot using fabric tape (figure 11).

14. Unscrew old ground line in wheel arch from ground point and cut off (figure 12).

Figure 12

15. Screw new ground line onto ground point in wheel arch with 10 Nm.

16. Route entire new wiring harness parallel to the previous wiring harness and wrap in fabric tape (figure 13). Attach old and new wiring harness at the marked locations (during removal) with cable ties and clips according to the original condition.

In individual cases, an additional cable duct can be installed. If the new wiring harness does not fit in the cable duct, the old ground cable and old power supply cable must be accordingly removed.

IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.

Only in case of routing in cable duct

16.1. Slide back protective hose of old wiring harness up to start of cable duct.

16.2. Cut off old ground cable and old power supply cable in front of cable duct (arrow, see figure 13). This is necessary, as the cable duct is too small for two wiring harnesses.

IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.

Figure 13

Only in case of routing in protective hose without cable duct

16.1. Cut off old power connector (figure 14) and wrap cable ends in fabric tape.

IMPORTANT: The original FlexRay cable installed in the vehicle remains in the vehicle and may in no case be damaged.

Figure 14

17. Connect power connector and FlexRay connector again to steering.

18. Assemble in reverse order.

In the case of hybrid and all-electric vehicles, the HV system must be recommissioned.

Primary Parts Information

* The replacement parts must be determined according to VIN via Xentry Portal Parts process (XPPI). ** 1 packaging unit must be used for 2 vehicles.

Warranty Information 

Operation: Check electrical wiring harness of steering (02-1035)

Includes: Remove/install underfloor paneling

Replace ground line of steering (after check)(02-1036)

Replace power supply of steering (after check)(02-1037)

Includes: Replace ground line of steering

Extra work for: Replace power supply of steering in veh. with 48 V on-board electrical System (02-1038)

Additional operation for hybrid and all-electric vehicles Perform power disconnect/commissioning for high-voltage on-board electrical system (02-2193)

Create TIPS case (02-2186)

ONLY in case of moisture in connector or  fault code P0603500 or C159800 in the steering control unit N68

Perform quick test (02-1853)

ONLY in case of visible damage to line (strands visible)

Extra work for: Remove/install engine compartment lining in vehicle with underbody                        protection (02-9676)

*Cannot be claimed in combination with 02-1037

Note

Operation Number labor times are subject to change.

P-RC-2020110012

IMPORTANT RECALL CAMPAIGN UPDATE

Please see the attached documents related to the campaign listed above.

Please note that all customer inquiries should be directed to the Customer Assistance Center at 1-800-FOR-MERCEDES.

Sincerely,

Gregory Gunther

Department Manager, Vehicle Compliance & Analysis

A Mercedes-Benz AG Company

A Mercedes-Benz AG Company

Mercedes-Benz Part 573 Submission
Original Submitted to Portal October 23, 2020
Chronology-Only section
Supplement to Original Submission

Chronology of Defect/Noncompliance Determination

In January 2020, MBAG launched initial investigations based on a finding on an internal vehicle that experienced a loss of the electric power steering assist. It was found that this vehicle had a damaged wiring harness which allowed moisture ingress into the wiring harness. The moisture subsequently entered into the steering control unit which resulted in the loss of the electric power steering assist. An analysis was initiated with the supplier. The initial results of the analysis indicated a deviation in the cutting process of the wiring harness at the supplier.

Further investigations were started to understand whether there was a more widespread possibility for damage to other wiring harnesses and if so, the extent of potential damage on the wiring harness and possibility of moisture ingress. During this process, the production plant reported additional vehicles that were found to have experienced a loss of electric power assist. MBAG reviewed its warranty claims and other field data and did not find any reports that were potentially related to this issue.

These findings indicated that if a vehicle were to have a damaged wiring harness, the part would have already been installed having prior damage rather than incurred during the production process.

MBAG reviewed its supplier's production process in detail to understand the point in the process at which the wiring harnesses may have been damaged. The damaged wiring harnesses of vehicles identified at the production plant were reviewed in comparison to the supplier's processes.

As a result, the root cause could be limited to a production deviation caused by incorrect parameters set in the process of cutting the wiring harnesses at the supplier. A correction of the process was immediately implemented at the supplier in February 2020.

Starting in February 2020, MBAG also analyzed the potential for vehicles in the field to have departed the production plant with a potentially affected wiring harness. In parallel, the range of potentially affected vehicles in the field was determined up to July 2020 based on logistics documents and supplier information.

Furthermore, a detailed analysis of the potential consequences of the damaged wiring harness was started. Other than the short-term consequences, an estimation of the risk over time for the affected vehicles was performed and compared to experiences and existing test results.

In October 2020, MBAG determined that a potential safety risk cannot be ruled out.

4 Affected Products

Vehicles

6 Associated Documents

Chronology

RMISC-20V651-9967.pdf 66.587KB

Recall Acknowledgement

RCAK-20V651-4466.pdf 244.846KB

Recall 573 Report - Amendment 1

RCLRPT-20V651-2444.PDF 215.979KB

Defect Notice 573 Report

RCLRPT-20V651-9034.PDF 215.978KB

Manufacturer Notices(to Dealers,etc)- Recall Campaign Initial Notification Replace Steering Control Unit Wiring Harness Insulation MY20 253 (GLC-Class)

RCMN-20V651-1821.pdf 103.127KB

Remedy Instructions and TSB

RCRIT-20V651-1128.pdf 528.535KB

Latest Recalls Documents

https://www-odi.nhtsa.dot.gov/acms/cs/documentList.xhtml?docId=20V651&docType=RCL

For the most up to date documents from NHTSA for this Recall, click the lick above

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Bestseller No. 8

Autel MaxiSys MS906BT Automotive Diagnostic Scan Tool (Advanced Ver. of MaxiSys MS906 DS808 MP808) Plus $60 Valued MV108, ECU Coding, Bi-Directional Control, 31 Services, OE All Systems Diagnosis

• 👍【UPGRADED OF MS906/ DS708, SAME AS MS908S/MK908P】As the upgrade version of MX808 MK808 MK808BT DS708 MP808 DS808 MS906, MS906BT comes with doubled battery capacity(10000 mAh) and German wireless technology, integrades advanced ECU coding (same as MS908S), Bi-directional control, 31+ services, VW/Audi Guided functions, custom settings, All system diagnosis (same as MS908 MK908P), covering 10,000 + car models in the market. Compatible with Autel Add-On, such as MV108 inspection camera(Included).
• 👍【31 SERVICE OPTIONS, 2021 NEW VERSION】 As a professional automotive scanner, Autel MS906BT auto scanner perform various maintenance reset functions like Oil Reset, EPB, SAS, DPF, BMS, ABS bleed, Throttle, Suspension, Injector Coding, Key Fob Coding, Power Balance, Transmission Adaptation, and etc. NOTE: Service options do NOT work on all cars. Send VIN number to 🚘autelofficial @ outlook . com🚘 to check compatibility before purchase. NOTE: MS906BT does NOT have TPMS services.
• 👍【ADVANCED ECU CODING】Same as MaxiSys MS908, workshop level scan tool MS906BT supports advanced ECU coding(not ECU programming) to help mechanics unfold the hidden features or disable annoying functions etc. to suit car owners' customized needs, while MaxiSys MS906 supports rarely of this function. This functions worthing $1000+. Compare with MS906, MS906BT is more powerful, it has the same diagnostic and services functions as maxiSys Elite/MS908(S). A powerful tool for diagnostic & services.
• 👍【BI-DIRECTIONAL CONTROL SAME AS MS908 MK908P,】As one of the most welcomed workshop diagnostic tool, Autel MaxiSys MS906BT features Bi-directional Control, also know as Active Test (worthing $500+), allows users to send commands to the tested ECUs and monitor the activity of the actuators, to make sure every components in working condition. Such as windows up/ down, switch on/off, etc. 👉NOTE: Funtions NOT universal, pls send VIN to 🚘autelofficial @ outlook . com🚘 to check before order.
• 👍【OE ALL SYSTEMS DIAGNOSIS SAME AS MS908S ELITE】 MaxiSys MS906BT is a professional diagnostic scan tool that has the same level to scan available vehicle modules as MS908S/ Elite including ABS, SRS(Airbag), Engine, Transmission, PCM, ECM, EPS, PDM, TPM, BCM, ABS and SCCM and more with complete capabilities for codes, live data, active test, ECU information, adaptation, matching, ECU coding etc. 👉Please send VIN to 🚘autelofficial @ outlook . com🚘 to check before order.

$1,299.00

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Bestseller No. 9

OBDLink MX+ OBD2 Bluetooth Scanner for iPhone, Android, and Windows

• Turn your iPhone, Android device, or Windows PC into a professional-grade diagnostic scan tool
• Recommended adapter for FORScan, Torque, BimmerCode, Dashcommand, AlfaOBD, Carista and many more
• Enhanced OEM support for Ford, GM, Mazda, Nissan/Infinity, Toyota/Lexus/Scion, Honda, Hyundai, Kia
• Clear Check Engine Light and get more live parameters (ABS, SRS, TPMS, etc) than any other scanner
• Over-voltage and battery drain protection, firmware updates

$119.95

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SaleBestseller No. 10

MOTOPOWER MP69033 Car OBD2 Scanner Code Reader Engine Fault Code Reader Scanner CAN Diagnostic Scan Tool for All OBD II Protocol Cars Since 1996, Yellow

• ✅【Multi-Functions】- Practical Multi-Functions OBD2 code reader features built-in OBD2 DTC lookup library, which help you to determine the cause of the engine light, read code, erase code, view freeze frame, I/M ready, vehicle information, data flow, real-time curve, get vehicle speed information, calculate load value, engine coolant temperature, get engine speed.
• ✅【Wide Capability】- Supports 9 protocols compatible with most 1996 US-Based, 2000 EU-Based and Asian cars, and newer OBD II & CAN domestic or import vehicles. Supports 6 languages - English,German, Dutch, Spanish, French, Italian.
• ✅【LCD Display】- Designed with a clear display LCD screen (128 x 64 pixels) - white backlight and contrast adjustment. No need any battery or charger, OBD reader gets the power directly from your vehicle through the OBDII Data Link Connector.
• ✅【Compact Design】- Car diagnostic scanner is equipped with a 2.5 feet long cable and made of a very thick flexible insulator.There are 6 buttons on OBD2 Scanner:scroll up/down,enter/exit and buttons that quick query VIN vehicle number& the DTC fault code.
• ✅【ABS / Airbag codes NOT Supported】- It is able to read and clear check engine information which is part of OBDII system, but it cannot work with non-OBDII systems, including ABS / Airbag / Oil Service Light, etc.

$23.85

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Last update on 2021-12-05 / Affiliate links / Images from Amazon Product Advertising API