Heated Steering Wheel Control Unit Input Test (2019 2020 2021)

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 (2017 2018 2019 2020 2021) , or SRS Component Location Index , and SRS Precautions and Procedures before doing repairs, or servicing.
Before testing, make sure the No. A27 fuse is OK. - Refer to: Fuse to Components Index (2016 2017 2018) , or Fuse to Components Index (2016 2017 2018) , or Fuse to Components Index (Without Auto Idle Stop System) (2019 2020 2021) , or Fuse to Components Index (With Auto Idle Stop System) (2019 2020 2021) .
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.

Heated Steering Wheel Control Unit 14P Connector (female terminals)

Courtesy of HONDA, U.S.A., INC.

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	RED	Disconnect the gauge control module connector A (32P) and the 12 volt battery sensor 2P connector	Check for continuity between terminal No. 8 and gauge control module connector A (32P) terminal No. 23: There should be continuity.	Faulty cable reel An open in the LIN (METER) wire
8	RED		Check for continuity to ground:There should be no continuity.	Faulty cable reel A short to ground in the LIN (METER) wire
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
12	PUR	Disconnect the gauge control module connector A (32P)	Check for continuity between terminal No. 12 and gauge control module connector A (32P) terminal No. 5: There should be continuity.	Faulty cable reel An open in the DISTANCE GND HSW wire
12	PUR	Disconnect the gauge control module connector A (32P)	Check for continuity to ground: There should be no continuity.	Faulty cable reel A short to ground in the DISTANCE GND HSW 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 (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.	Blown No. A27 fuse - Refer to: Fuse to Components Index (2016 2017 2018) , or Fuse to Components Index (2016 2017 2018) , or Fuse to Components Index (Without Auto Idle Stop System) (2019 2020 2021) , or Fuse to Components Index (With Auto Idle Stop System) (2019 2020 2021) . Faulty heated steering wheel relay Faulty cable reel An open or high resistance in the wire
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.	A short to ground in the wire Poor connection Faulty heated steering wheel control unit
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.	A short to ground in the wire Poor connection Faulty heated steering wheel control unit
5*14	LT BLU*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.	Faulty heated steering wheel switch An open or high resistance in the wire
5*14	LT BLU*PNK	Vehicle ON mode, and heated steering wheel button released	Measure the voltage between terminals No. 5 and No. 14:There should be battery voltage.	Faulty heated steering wheel switch A short to ground in the wire
10	BLU	Vehicle ON mode	Connect to ground with a jumper wire:The heated steering wheel switch indicator should come on.	Faulty heated steering wheel switch An open or high resistance in the ground wire