Circuit/System Testing

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 audio steering wheel control switches.
2. Ignition ON, test for 12 volts between the voltage supply circuit and ground at the right switch harness connector.
   • If less than 10 volts, test the voltage supply circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the 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 an open/high resistance. If circuits test normal, replace the BCM.
4. Remove the 3-amp fused jumper wire.
5. Ignition OFF, test the jumper wire for less than 1.0 ohm of resistance between the left and right switch connectors.
   • If greater than 1.0 ohm, test the jumper wire circuit for an open/high resistance.
6. If circuit tests normal, test or replace the switch.