Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac XLR. However, it is still accessible from the selected car via links, so may be relevant.

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

CAUTION: Refer to SIR Caution .

Ignition OFF, disconnect the X1 harness connector at the MUTE/SEEK + switch.
Ignition ON, test for ignition voltage between the ignition circuit terminal 5 and ground.
- If less than the specified range, test the ignition circuit for a short to ground or open/ high resistance. If circuit test normal, and the fuse is ok, replace Run/Crank relay.
Test for 0 volts between the signal circuit terminal 6 and ground.
- If greater than the specified range, test the signal circuit for short to voltage. If circuit test normal, replace BCM.
Test for ignition voltage between the ignition circuit and the signal circuit terminal 6.
- If less than the specified range, test the signal circuit for an open/high resistance. If circuit test normal, replace BCM.
Ignition OFF, disconnect the X2 harness connector at the BCM.
Test for infinite resistance between the signal circuit terminal 57 and ground.
- If less than the specified range, test the signal circuit for short to ground. If circuit test normal, test or replace switch.
If all circuits test normal, test or replace the switch.