Heated Steering Wheel Control Unit Input Test
SRS components are located in this area. Review the SRS component locations and the precautions and procedures before doing repairs or service.

NOTE:
Make sure the fuses associated with the system is OK.
After testing, clear the SRS control unit DTCs.

1.
Turn the vehicle to the OFF (LOCK) mode.

2.
Disconnect the heated steering wheel control unit 14P connector.
Heated Steering Wheel Control Unit 14P Connector (female terminals)
3.
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 4.

4.
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 5.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result is not obtained
8
LT GRN
Disconnect the audio remote-HFL switch 12P connector
Check for continuity between terminal No. 8, and audio remote-HFL switch 12P connector terminal No. 11:
There should be continuity.
An open in the HSW LIN wire
Check for continuity to ground:
There should be no continuity.
A short to ground in the HSW LIN wire
7
BLU
Disconnect the steering heater 4P connector
Check for continuity between terminal No. 7 and steering wheel heater 4P connector terminal No. 4:
There should be continuity.
An open or high resistance in the wire

5.
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.

Cavity
Wire
Test condition
Test: Desired result
Possible cause if desired result is not obtained
2
RED
Vehicle ON mode
Measure the voltage to ground:
There should be battery voltage.
Faulty heated steering wheel relay
Faulty cable reel
An open or high resistance in the wire
12
BLK
In all power modes
Measure the voltage to ground:
There should be less than 0.2 V.
Faulty audio remote-HFL switch
Faulty cable reel
An open or high resistance in the ground wire
1
PUR
Disconnect the steering wheel heater 4P connector, vehicle ON mode, and heated steering wheel switch ON
Measure the voltage to ground:
There should be battery voltage.
A short to ground in the wire
6
TAN
Disconnect the steering wheel heater 4P connector, vehicle ON mode, and heated steering wheel switch ON
Measure the voltage to ground:
There should be 5 V.
A short to ground in the wire
5
?
14
YEL
?
GRY
Vehicle ON mode, and heated steering wheel switch 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
Vehicle ON mode, and heated steering wheel switch 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
PNK
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