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B2850-15






B2850-15-DRIVER DOOR AMBIENT LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

An ambient lamp can be a: map pocket, door handle, halo ring, cup holder, etc. It is a LED with a built in circuit board. The BCM controls the operation and sends a bus message to the Door Module to turn the lamps on or off.

- When Monitored:
Whenever the ambient lamp is commanded to be on.

- Set Condition:
When the Driver Door Ambient Lamp Driver circuit is on when it should be off or off when it should be on, for over 2000 ms. and the above conditions are met, this code will set.





1. TEST FOR INTERMITTENT CONDITION

NOTE: Be sure the thumbwheels on the Dimmer Module are turned fully on during this test.

1. Turn the ignition on.
2. With the scan tool, record and erase the DTCs.
3. Cycle the ignition on to off three times and leave in the Lock position.
4. Turn the park lamps on.
5. Turn the ignition on and wait one minute.
6. With the scan tool, read the active DTCs.

Does the scan tool display: B2850-15-DRIVER DOOR AMBIENT LAMP CONTROL - CIRCUIT SHORT TO BATTERY OR OPEN?

Yes

- Go To 2

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (M33) DRIVER DOOR AMBIENT LAMP DRIVER CIRCUIT SHORTED TO VOLTAGE




1. Turn the ignition off.
2. Remove the inner door panel trim. Front Door Trim Panel - Removal.
3. Leave the Driver Door Map Pocket and Handle Lamp connector connected.
4. Disconnect the Driver Door Module C5 harness connector.
5. Turn the ignition on.
6. Measure the voltage between ground and the (M33) Driver Door Ambient Lamp Driver circuit in the Driver Door Module C5 harness connector.

Is there any voltage present?

Yes

- Repair the (M33) Driver Door Ambient Lamp Driver circuit for a short to voltage.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (M33) DRIVER DOOR AMBIENT LAMP DRIVER CIRCUIT OPEN




1. Turn the ignition off.
2. Be sure the Driver Door Map Pocket and Handle Lamps connectors are still connected.
3. Turn the ignition on.
4. Connect a fused jumper wire, connected to battery to the (M33) Driver Door Ambient Lamp Driver circuit in the DDM C5 harness connector.
5. Connect a jumper wire, connected to ground to the (M34) Driver Door Lighting Return circuit in the DDM C5 harness connector

Do the Driver Door Map Pocket and Handle Lamps illuminate brightly?

Yes

- Replace the Driver Door Module. Door Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. (M33) DRIVER DOOR AMBIENT LAMP DRIVER CIRCUIT OPEN




1. Disconnect the Driver Door Map Pocket and Handle Lamp harness connectors.
2. Measure the resistance of the (M33) Driver Door Ambient Lamp Driver circuit between the DDM C5 harness connector and the Driver Door Map Pocket Lamp harness connector.
3. Measure the resistance of the (M33) Driver Door Ambient Lamp Driver circuit between the DDM C5 harness connector and the Driver Door Handle Lamp harness connector.

Is the resistance below 2.0 Ohms on both the Map Pocket and Handle circuits?

Yes

- Go To 5

No

- Repair the open in the (M33) Driver Door Courtesy Lamp Driver circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

5. (M34) DRIVER DOOR LIGHTING RETURN CIRCUIT OPEN




1. Measure the resistance of the (M34) Driver Door Lighting Return circuit between the DDM C5 harness connector and the Driver Door Map Pocket Lamp harness connectors.
2. Measure the resistance of the (M34) Driver Door Lighting Return circuit between the DDM C5 harness connector and the Driver Door Handle Lamp harness connectors.

Is the resistance below 2.0 Ohms on both the Map Pocket and Handle circuits?

Yes

- Replace the Driver Door Ambient Lamp(s) as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Repair the open in the (M34) Driver Door Lighting Return circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

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