Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2012 >> Cruze LS, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 202 (Lighting System) >> Diagnostic Information and Procedures >> Interior Backlighting Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2011 Chevrolet Cruze. However, it is still accessible from the selected car via links, so may be relevant.

Dimmer Switch Circuit Test

  1. Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
  2. Test for less than 5 Ω between the ground circuit harness connector terminal 6 and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, connect a test lamp between the 12 V reference circuit terminal 1 and ground.
    • If the test lamp is always OFF, test the 12 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  4. Ignition ON, test for less than 0.3 V between dimming signal circuit terminal 12 and ground.
    • If greater than the specified range, test the dimming signal circuit terminal 12 for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
  5. Ignition OFF, reconnect the harness connector to the S30 Headlamp Switch.
  6. Ignition ON, put the S30 Headlamp Switch in the park lamps position and set the interior to maximum dim.
  7. Disconnect the harness connector at the S30 Headlamp Switch.
  8. Install a 3 A fused jumper wire between the signal circuit terminal 12 and the 12 V reference circuit terminal 1. The interior backlighting should now be dimmed.
    • If the interior backlighting is not dimmed, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
  9. If all circuits test normal, test or replace the S30 Headlamp Switch.

Interior Backlighting Circuit Test

  1. Ignition OFF, disconnect the harness connector at the appropriate inoperative backlighting component.
  2. Disconnect the negative terminal of the C1 Battery.
  3. Test for less than 5 Ω between the ground circuit terminal black wire and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  4. Reconnect the negative terminal to the C1 Battery.
  5. Connect a test lamp between the control circuit terminal yellow wire and ground.
  6. Ignition ON, command the LED Backlight Dimming test ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
  7. If all circuits test normal, test or replace the appropriate component with the inoperative backlighting.
scientia non olet · About Mike's Workshop Manuals