Circuit/System Testing

NOTE: It is recommended that Component Testing is performed before Circuit Testing when diagnosing steering wheel controls.

1. Ignition OFF, disconnect the harness connector at the left and right audio steering wheel control switches.
2. Ignition ON, test for 10-12 volts between the supply voltage circuit and ground at the right switch harness connector.
   • If less than 10 volts, test the supply voltage circuit for short to ground or open/high resistance. If circuit test normal, replace BCM.
3. Install a 3-amp fused jumper wire at the right switch supply voltage circuit. Toggle the jumper wire to the signal circuits at the left and the right harness connectors. Verify DTC B2815 sets.
   • If DTC B2815 does not set, test the signal circuits for a short to ground or open/high resistance. If circuit test normal, replace BCM.
4. Remove the 3-amp fused jumper wire.
5. Reconnect the right switch.
6. Ignition ON, test for 10-12 volts between the supply voltage circuit and ground at the left switch harness connector.
   • If less than 10 volts, test the supply voltage circuit for short to ground or open/high resistance. If circuit test normal, refer to component testing .
7. If all circuits test normal, refer to component testing .