Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Start the Engine.
2. With the scan tool, read Instrument Panel Cluster (IPC) DTCs and record on the repair order.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Go To 7
CHECK FOR BODY CONTROL MODULE (BCM) DTCS
1. With the scan tool, read Body Control Module (BCM) DTCs and record on the repair order.
  Are there any dimmer DTCs set in the BCM?
  
  Yes
  - Repair the BCM DTC(s). Refer to DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK THE (E12) PANEL LAMP DRIVER CIRCUIT FOR A SHORT TO VOLTAGE
1. Turn the ignition off.
2. Disconnect the Headlamp Switch harness connector.
3. Disconnect the IPC harness connector.
4. Turn the ignition on.
5. Measure the voltage of the (E12) Panel Lamps Driver circuit at the IPC harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (E12) Panel Lamps Driver circuit for a short to voltage.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (E12) PANEL LAMP DRIVER CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Check for continuity between ground and the (E12) Panel Lamps Driver circuit at the IPC harness connector.
  Is there continuity between ground and the (E12) Panel Lamps Driver circuit?
  
  Yes
  - Repair the (E12) Panel Lamps Driver circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
CHECK THE (E12) PANEL LAMP DRIVER CIRCUIT FOR AN OPEN OR HIGH RESISTANCE
1. Check the resistance of the (E12) Panel Lamps Driver circuit between the Headlamp Switch harness connector and the IPC harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (E12) Panel Lamps Driver circuit for an open or high resistance.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE HEADLAMP SWITCH
1. Replace the Headlamp Switch in accordance with the Service Information. Refer to SWITCH, HEADLAMP, REMOVAL .
2. Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  Did the DTC return?
  
  Yes
  - Replace the Instrument Cluster in accordance with the Service Information. Refer to REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete.
CHECK THE WIRING AND CONNECTORS
1. The conditions necessary to set the DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this Module. Wiggle the wiring and connectors while checking for shorted and open circuits.
3. Check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
4. Check Service Bulletins for any possible causes that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Test complete.