Circuit/System Testing
IMPORTANT:
It is recommended that Component Testing is performed before Circuit Testing when diagnosing steering wheel controls.
CAUTION:
Refer to SIR Caution
.
- Ignition OFF, disconnect the harness connector at the right steering wheel control switch.
- Ignition ON, test for ignition voltage between the ignition circuit terminal 1 and ground.
- If less than the specified value, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- Test for 0 volts between the signal circuit terminal 6 and ground.
- If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
- Test for ignition voltage between the ignition circuit terminal 1 and the signal circuit terminal 6.
- If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
- Install a 3A fused jumper wire at the ignition circuit terminal 1 and the ignition circuit jumper terminal 2.
- Disconnect the harness connector at the left steering wheel control switch.
- Test for ignition voltage between the ignition circuit jumper terminal 1 and ground.
- If less than the specified value, test the ignition circuit jumper for a short to ground, or an open/high resistance.
- Test for ignition voltage between the ignition circuit jumper terminal 1 and the signal circuit terminal 5.
- If less than the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
- Disconnect the harness connector X1 at the BCM.
- Test for infinite resistance between the signal circuit terminal B8 and ground.
- If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
- If all circuits test normal, test or replace the switch.