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Diagnosis Procedure
1.CHECK FUSE
  1. Ignition switch OFF.
  2. Check that the following fuse is not blown (open).
UnitLocationFuse No.Capacity
Heated steering wheel relayFuse block (J/B)#4010A
Is the fuse blown (open)?
Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).
.
 
2.CHECK HEATED STEERING WHEEL RELAY CONTROL SIGNAL CIRCUIT
  1. Disconnect A/C amp. connector.
  2. Ignition switch ON.
  3. Check voltage between A/C amp. harness connector and ground.
    +−Voltage
    A/C amp.
    ConnectorTerminal
    M5556GroundBattery voltage
Is the inspection result normal?
Replace A/C amp. Refer to Removal and Installation.
.
 
3.CHECK HEATED STEERING WHEEL RELAY POWER SUPPLY CIRCUIT FOR OPEN
  1. Ignition switch OFF.
  2. Remove heated steering wheel relay and disconnect fuse block (J/B) connector.
  3. Check continuity between heated steering wheel relay harness connector and fuse block (J/B) harness connector.
    Heated steering wheel relayFuse block (J/B)Continuity
    ConnectorTerminalConnectorTerminal
    M951M6812FExisted
Is the inspection result normal?
.
Repair harness or connector.
 
4.CHECK HEATED STEERING WHEEL RELAY CONTROL SIGNAL CIRCUIT FOR OPEN
Check continuity between heated steering wheel relay harness connector and A/C amp. harness connector.
Heated steering wheel relayA/C amp.Continuity
ConnectorTerminalConnectorTerminal
M952M5556Existed
Is the inspection result normal?
.
Repair harness or connector.
 
5.CHECK HEATED STEERING WHEEL RELAY CONTROL SIGNAL CIRCUIT FOR SHORT
Check continuity between A/C amp. harness connector and ground.
A/C amp.—Continuity
ConnectorTerminal
M5556GroundNot existed
Is the inspection result normal?
.
Repair harness or connector.
 
6.CHECK HEATED STEERING WHEEL RELAY
Check heated steering wheel relay. Refer to Component Inspection.
Is the inspection result normal?
INSPECTION END
Replace heated steering wheel relay.