Heated Steering Wheel Control Unit Input Test (2016 2017 2018)
NOTE:
- If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A - Refer to: Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (without the HDS), or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode B - Control Unit Not Communicating, or Body Electrical Troubleshooting - B-CAN System Diagnosis Test Mode A - Initial Communication and DTC Checks .
- SRS components are located in this area. Review the SRS component locations - Refer to: SRS Component Location Index (2016), or SRS Component Location Index (2017 2018 2019 2020 2021) , and precautions and procedures before doing repairs or servicing.
- Before testing, make sure the No. A27 (10 A) fuse in the under-hood fuse/relay box is OK.
- After testing, clear the SRS control unit DTCs.
1. Turn the vehicle to the OFF (LOCK) mode.
2. Do the 12 volt battery terminal disconnection procedure
3. Remove the heated steering wheel control unit - Refer to: Heated Steering Wheel Control Unit Removal and Installation (2016 2017 2018)Heated Steering Wheel Control Unit Removal and Installation (2019 2020 2021) .
4. Inspect the connector and socket terminals to be sure they are all making good contact:
- If the terminals are bent, loose, or corroded, repair them as necessary, and recheck the system.
- If the terminals are OK, go to step 5.
5. With the connector still disconnected, do the following input tests:
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, go to step 6.
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| 8 | BLU | Disconnect the gauge control module 32P connector and the 12 volt battery sensor 2P connector | Check for continuity between terminal No. 8 and gauge control module 32P connector terminal No. 23: There should be continuity. |
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| Check for continuity to ground: There should be no continuity. |
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| 7 | GRN | Disconnect the steering heater 4P connector | Check for continuity between terminal No. 7 and steering heater 4P connector terminal No. 4: There should be continuity. | An open or high resistance in the wire |
6. Reconnect the connector, and do the following input tests:
- If any test indicates a problem, find and correct the cause, then recheck the system.
- If all the input tests prove OK, replace the heated steering wheel control unit - Refer to: Heated Steering Wheel Control Unit Removal and Installation (2016 2017 2018) or Heated Steering Wheel Control Unit Removal and Installation (2019 2020 2021) .
| Cavity | Wire | Test condition | Test: Desired result | Possible cause if desired result is not obtained |
|---|---|---|---|---|
| 2 | WHT | Vehicle ON mode | Measure the voltage to ground: There should be battery voltage. |
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| 12 | BLK | In all power modes | Measure the voltage to ground: There should be less than 0.2 V. |
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| 1 | RED | Disconnect the steering heater 4P connector, vehicle ON mode, and heated steering switch ON | Measure the voltage to ground: There should be battery voltage. |
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| 6 | WHT | Disconnect the steering heater 4P connector, vehicle ON mode, and heated steering switch ON | Measure the voltage to ground: There should be 5 V. |
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| 5*14 | RED*PNK | Vehicle ON mode, and heated steering wheel button pressed | Measure the voltage between terminals No. 5 and No. 14: There should be less than 0.2 V. |
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| Vehicle ON mode, and heated steering wheel button released | Measure the voltage between terminals No. 5 and No. 14:There should be battery voltage. |
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| 10 | PUR | Vehicle ON mode | Connect to ground with a jumper wire:The heated steering wheel switch indicator should come on. |
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