B2850-11

B2850-11-DRIVER DOOR AMBIENT LAMP CONTROL - CIRCUIT SHORT TO GROUND





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.

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

- Set Condition:
When the Driver Door Ambient Lamp Driver circuit falls below 3.0 volts 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. Wait one minute.
6. With the scan tool, read the active DTCs.

Does the scan tool display: B2850-11-DRIVER DOOR AMBIENT LAMP CONTROL - CIRCUIT SHORT TO GROUND as active?

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. DRIVER DOOR HANDLE LAMP SHORTED




1. With the scan tool, erase the DTCs.
2. Turn the ignition off.
3. Remove the inner door panel trim. Front Door Trim Panel - Removal.
4. Make sure the Driver Door Handle Lamp connector is disconnected.
5. Re-connect the Driver Door Map Pocket Lamp connector.
6. Turn the park lamps on.
7. Turn the ignition on.
8. Wait one minute.
9. With the scan tool, read the active DTCs.

Does the scan tool display: B2850-11-DRIVER DOOR AMBIENT LAMP - CONTROL CIRCUIT SHORT TO GROUND as Active?

Yes

- Go To 3

No

- Replace the Driver Door Handle Lamp Assembly.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. DRIVER DOOR MAP POCKET LAMP SHORTED




1. With the scan tool, erase the DTCs.
2. Turn the ignition off.
3. Disconnect the Driver Door Map Pocket Lamp connector.
4. Be sure the park lamps are still on.
5. Turn the ignition on.
6. Wait one minute.
7. With the scan tool, read the active DTCs.

Does the scan tool display: B2850-11-DRIVER DOOR AMBIENT LAMP - CONTROL CIRCUIT SHORT TO GROUND as Active?

Yes

- Go To 4

No

- Replace the Driver Door Map Pocket Lamp Assembly.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

4. (M33) DRIVER DOOR AMBIENT LAMP DRIVER CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the Driver Door Module C5 harness connector.
3. Measure the resistance between Ground and the (M33) Driver Door Ambient Lamp Driver circuit in the DDM C5 harness connector.

Is the resistance below 20K Ohms?

Yes

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

No

- Go To 5

5. (M33) DRIVER DOOR AMBIENT LAMP DRIVER CIRCUIT SHORTED TO THE (M34) DRIVER DOOR LIGHTING RETURN CIRCUIT




1. Measure the resistance between the (M33) Driver Door Ambient Lamp Driver circuit and the (M34) Driver Door Lighting Return circuit in the DDM C5 harness connector.

Is the resistance below 20K Ohms?

Yes

- Repair the short between the (M33) Driver Door Ambient Lamp Driver circuit and the (M34) Driver Door Lighting Return circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

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