*PANEL DIMMING INOPERATIVE
For a complete wiring diagram Refer to Section 8W.
| Possible Causes |
| PANEL ILLUMINATION DTC PRESENT |
| ILLUMINATION BULB(S) |
| (L78) FUSED PARK LAMP RELAY OUTPUT CIRCUIT SHORT TO GROUND |
| (L78) FUSED PARK LAMP RELAY OUTPUT CIRCUIT OPEN |
| (E2) PANEL LAMPS DRIVER CIRCUIT SHORT TO VOLTAGE |
| ILLUMINATED COMPONENT INTERNALLY SHORTED |
| (E2) PANEL LAMPS DRIVER CIRCUIT SHORT TO GROUND |
| INSTRUMENT CLUSTER |
Diagnostic Test
1. PANEL ILLUMINATION DTC PRESENTTurn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display any MIC or BCM DTCs?
Yes
- Refer to symptom list for problems related to BCM or Instrument Cluster DTCs
No
- Go To2
2. ILLUMINATION BULB(S)
Turn the ignition on.
Turn the Park Lamps on and adjust the dimming switch to maximum brightness.
Are all of the Instrument Cluster illumination bulbs inoperative?
Yes
- Go To3
No
- Replace the Illumination Bulb(s) as necessary in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
3. FUSED PARK LAMP RELAY OUTPUT CIRCUIT SHORT TO GROUND
Turn the ignition off.
Remove and inspect the #9 Fuse in the Junction Block.
If the fuse is open, replace with proper rated fuse.
Turn the Park Lamps on for 1 minute.
Turn the ignition off.
Remove and inspect the #9 Fuse in the Junction Block.
Is the #9 Fuse in the Junction Block open?
Yes
- Using the wiring diagram/schematic as a guide, repair the Fused Park Lamp Relay Output circuit for a short to ground (between the Junction Block and the Instrument Cluster).
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To4
4. PARK LAMP RELAY OUTPUT CIRCUIT OPEN
Turn the ignition on.
Turn the Park Lamps on.
Measure the voltage between the #9 Fuse in the Junction Block and ground.
Is the voltage above 10.5 volts?
Yes
- Go To5
No
- Repair the Junction Block in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
5. (L78) FUSED PARK LAMP RELAY OUTPUT CIRCUIT OPEN
Turn the ignition off.
Disconnect the Instrument Cluster harness connector.
Turn the ignition on.
Turn the Park Lamps on.
Measure the voltage between the (L78) Fused Park Lamp Relay Output circuit and ground.
Is the voltage above 10.5 volts?
Yes
- Go To6
No
- Repair the (L78) Fused Park Lamp Relay Output circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
6. (E2) PANEL LAMPS DRIVER CIRCUIT SHORT TO VOLTAGE
Turn the ignition off.
Measure the voltage between the (E2) Panel Lamps Driver circuit and ground.
Is there any voltage present?
Yes
- Repair the (E2) Panel Lamps Driver circuit for a short to voltage.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To7
7. ILLUMINATED COMPONENT INTERNALLY SHORTED
Turn the ignition off.
Ensure that the Instrument Cluster harness connector is connected.
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors to all of the illuminated components.
Turn the ignition on.
Turn the Park Lamps on.
While disconnecting components, inspect for Instrument Cluster illumination.
Does the Instrument Cluster illumination operate after disconnecting any component?
Yes
- Replace the illuminated component as necessary.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To8
8. (E2) PANEL LAMPS DRIVER CIRCUIT SHORT TO GROUND
Turn the ignition off.
Disconnect the Instrument Cluster harness connector.
Using the wiring diagram/schematic as a guide, ensure that all illuminated components are disconnected.
Measure the resistance between ground and the (E2) Panel Lamps Driver circuit.
Is the resistance below 5.0 ohms?
Yes
- Repair the (E2) Panel Lamps Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace and configure the Instrument Cluster in accordance with the Service Information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)