Diagnostic Routine F
Diagnostic Routine F
Diagnostic Overview
One Or More Interior Courtesy Lamps Are Inoperative
Refer to Wiring Diagram Set 89 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
REFER to Courtesy Lamps .
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect the bulbs and make sure they are OK.
- Inspect the BCM (Body Control Module) fuse 60 (10A).
- Inspect the interior lamp for damage.
Pinpoint Test
1. CHECK THE DOOR AJAR PIDs (Parameter Identifications)
1. Ignition ON.
2. Using a scan tool, view the BCM (Body Control Module) PIDs (Parameter Identifications).
3. Monitor the BCM (Body Control Module) DOOR_SW_LR, DOOR_SW_PSGR, DOOR_SW_LR and DOOR_SW_RR PIDs (Parameter Identifications) while opening and closing all the doors.
Do all the door ajar switch PID (Parameter Identification) values agree with the door positions?
2. CHECK THE OPERATION OF ALL THE INTERIOR COURTESY LAMPS
1. Open a door and observe the interior courtesy lamps.
Are all the interior courtesy lamps inoperative?
3. CHECK FOR VOLTAGE TO THE FRONT/DRIVER COURTESY LAMP
1. Close the door.
2. Ignition OFF.
3. Disconnect: Driver Interior Lamp C908 (vehicles with a roof opening panel).
4. Disconnect: Front Interior Lamp C931 (vehicles without a roof opening panel).
5. Ignition ON.
6. For a front interior lamp, measure:
7. For a driver interior lamp, measure:
Is the voltage greater than 11 volts?
4. BYPASS THE BCM (Body Control Module) (INTERIOR LIGHT RELAY)
1. Ignition OFF.
2. Connect: Driver Interior Lamp C908 (vehicles with a roof opening panel).
3. Connect: Front Interior Lamp C931 (vehicles without a roof opening panel).
4. Disconnect: BCM (Body Control Module) C2280F.
5. Connect:
6. Ignition ON.
7. Open any door.
Do the courtesy lamps illuminate?
5. CHECK THE FRONT/DRIVER COURTESY LAMP GROUND CIRCUIT FOR AN OPEN
1. For a front interior lamp, measure:
2. For a driver interior lamp, measure:
Is the voltage greater than 11 volts?
6. BYPASS THE BCM (Body Control Module) GROUND CONTROL
1. Ignition OFF.
2. Connect: Front Interior Lamp C931 (vehicles without a roof opening panel).
3. Connect: Driver Interior Lamp C908 (vehicles with a roof opening panel).
4. Disconnect: BCM (Body Control Module) C2280H.
5. Connect:
6. Ignition ON.
7. Open any door.
Do the courtesy lamps illuminate?
7. CHECK THE COURTESY LAMP GROUND CONTROLLED CIRCUIT FOR AN OPEN
1. Disconnect: Front Interior Lamp C931 (vehicles without a roof opening panel).
2. Disconnect: Driver Interior Lamp C908 (vehicles with a roof opening panel).
3. For a front interior lamp, measure:
4. For a driver interior lamp, measure:
Is the voltage greater than 11 volts?
8. CHECK THE FOOTWELL LAMP GROUND CONTROLLED CIRCUIT FOR AN OPEN
1. Ignition OFF.
2. Disconnect: BCM (Body Control Module) C2280C.
3. Connect:
4. Ignition ON.
Do the footwell lamps illuminate?
9. CHECK FOR VOLTAGE TO THE INOPERATIVE INTERIOR COURTESY LAMP
1. Ignition OFF.
2. Disconnect: Inoperative Interior Lamp.
3. Ignition ON.
4. For an incandescent footwell lamp, measure:
5. For a LED (Light-emitting Diode) footwell lamp, measure:
6. For a passenger or rear courtesy lamp, measure:
Is the voltage greater than 11 volts?
10. CHECK THE COURTESY LAMP GROUND CIRCUIT FOR AN OPEN
1. For an incandescent footwell lamp, measure:
2. For a LED (Light-emitting Diode) footwell lamp, measure:
3. For a passenger or rear courtesy lamp, measure:
Is the voltage greater than 11 volts?
11. CHECK THE PASSENGER/REAR LAMP CONTROL CIRCUIT FOR REFERENCE VOLTAGE
1. Open any door.
2. For a rear interior lamp on vehicles not equipped with a roof opening panel, measure:
3. For a passenger interior lamp, measure:
4. For a rear interior lamp on vehicles equipped with a roof opening panel, measure:
Is the voltage between 4 and 6 volts?
12. CHECK THE REAR LAMP CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition OFF.
2. Disconnect: Front Interior Lamp C931.
3. Ignition ON.
4. Measure:
Is any voltage present?
13. CHECK THE REAR LAMP CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Ignition OFF.
2. Measure:
Is the resistance greater than 10,000 ohms?
14. CHECK THE REAR LAMP CONTROL CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 3 ohms?
15. ISOLATE THE PASSENGER INTERIOR LAMP
1. Close the door.
2. Ignition OFF.
3. Disconnect: Passenger Interior Lamp C903.
4. Open any door.
Does the rear interior lamp illuminate?
16. ISOLATE THE REAR INTERIOR LAMP
1. Close the door.
2. Connect: Passenger Interior Lamp C903.
3. Disconnect: Rear Interior Lamp C901.
4. Open any door.
Does the passenger interior lamp illuminate?
17. CHECK THE PASSENGER/REAR LAMP CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
1. Close the door.
2. Disconnect: Passenger Interior Lamp C903.
3. Disconnect: Driver Interior Lamp C908.
4. Ignition ON.
5. Measure:
Is any voltage present?
18. CHECK THE PASSENGER/REAR LAMP CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Ignition OFF.
2. Measure:
Is the resistance greater than 10,000 ohms?
19. CHECK THE PASSENGER/REAR LAMP CONTROL CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 3 ohms?
20. CHECK FOR CORRECT BCM (Body Control Module) OPERATION
1. Disconnect the BCM (Body Control Module) connectors.
2. Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals or pins)
- pushed-out pins - install new pins as necessary
3. Reconnect the BCM (Body Control Module) connectors and make sure they seat and latch correctly.
4. Operate the system and determine if the concern is still present.
Is the concern still present?
