DIAGNOSIS AND TESTING
B161A-COURTESY/DOME LAMP CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
- Continuously
- Set Condition:
- When the Instrument Cluster detects a short to battery on the Control circuit.
| Possible Causes |
| (M24) COURTESY LAMPS DRIVER CIRCUIT SHORT TO GROUND |
| (M24) COURTESY LAMPS DRIVER CIRCUIT OPEN |
| INSTRUMENT CLUSTER |
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITIONTurn the ignition on.
Clear all Instrument Cluster DTC's
Turn the Courtesy Lamps on.
With the scan tool, read DTC's.
Does the scan tool read: B161A-COURTESY/DOME LAMP CONTROL CIRCUIT?
Yes
- Go To 2
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
2. CHECK THE (M24) COURTESY LAMPS DRIVER CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Measure the resistance between the (M24) Courtesy Lamp Driver circuit and ground.
Is the resistance below 5.0 ohms?
Yes
- Repair the (M24) Courtesy Lamp Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To 3
3. CHECK THE (M24) COURTESY LAMPS DRIVER CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Turn the ignition on.
Measure the voltage of the (M24) Courtesy Lamp Driver circuit.
Is the voltage below 10.0 volts?
Yes
- Repair the (M24) Courtesy Lamp Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Instrument Cluster in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
B161E-READING LAMP CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
- Continuously
- Set Condition:
- When the Instrument Cluster detects a short to battery on the Control circuit.
| Possible Causes |
| (M24) COURTESY LAMP DRIVER CIRCUIT SHORT TO GROUND |
| (M24) COURTESY LAMP DRIVER CIRCUIT OPEN |
| INSTRUMENT CLUSTER |
Diagnostic Test
1. TEST FOR INTERMITTENT CONDITIONTurn the ignition on.
Clear all Instrument Cluster DTC's
Turn the Courtesy Lamps on.
With the scan tool, read DTC's.
Does the scan tool read: B161E-READING LAMP CONTROL CIRCUIT?
Yes
- Go To 2
No
- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
2. CHECK THE (M24) COURTESY LAMP DRIVER CIRCUIT FOR A SHORT TO GROUND
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Measure the resistance between the (M24) Courtesy Lamp Driver circuit and ground.
Is the resistance below 5.0 ohms?
Yes
- Repair the (M24) Courtesy Lamp Driver circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Go To 3
3. CHECK THE (M24) COURTESY LAMP DRIVER CIRCUIT FOR AN OPEN
Turn the ignition off.
Disconnect the Instrument Cluster C2 harness connector.
Activate the left and right vanity lamps (if equipped), the glove box lamp, and the left and right door handle lamps.
Turn the ignition on.
Measure the voltage of the (M24) Glove Box Lamp Driver circuit.
Is the voltage below 10.0 volts?
Yes
- Repair the (M24) Courtesy Lamp Driver circuit for an open.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace the Instrument Cluster in accordance with the service information.
- Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)