Driver Door Module (DDM, DMFL/R)

B1F05-11-ELECTROCHROMATIC MIRROR CONTROL CIRCUIT-CIRCUIT SHORT TO GROUND

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





Theory of Operation

The driver electrochromatic mirror is controlled by the Body Control Module (BCM). The BCM receives the dimming control from the sensor in the Interior Rearview Mirror. The BCM send a Bus message to the Driver Door Module (DDM) which turns the dimming on and off. At night the dimming will be cancelled when the vehicle is in reverse.

- When Monitored:
Whenever the module is awake and the park lamps are on.

- Set Condition:
Whenever the Body Control Module sends a command to the Door Module to turn the Day/Night dimming on and the Auto Day/Night Mirror Signal circuit is shorted low, this code will set.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, record and erase the DTCs.
3. Block the Light Sensor in the Interior Rearview Mirror.
4. Shift the transmission to Drive (engine not running)
5. Turn the drivers side turn signal on.
6. Turn the park lamps on.
7. Turn the rear defogger on, if equipped with heated mirror.
8. Press and release the Mirror Select switch to select the Driver Outside Rearview Mirror.
9. Fold And Unfold the mirrors several time, if equipped with folding mirrors.
10. Operate the Mirror Adjust switch in all directions several times while monitoring the scan tool for DTCs. NOTE: After adjusting the mirror in one direction wait at least two seconds before adjusting the mirror in the opposite direction, as this will allow time for an active fault to set if present.

11. With the scan tool, read the active DTCs.

Does the scan tool display; B1F05-11-ELECTROCHROMATIC CONTROL CIRCUIT - 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. INSPECT MIRROR CONNECTIONS
1. Turn the ignition off.
2. Disconnect the Driver Outside Rearview Mirror C1 and C2 connectors at the Drivers Door Module.
3. Inspect the wiring harness, connectors and the Door Module for any breaks, bent terminals or crossed wiring.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

- Go To 3

3. MIRROR OR MODULE
1. Turn the ignition on.
2. Block the Light Sensor in the Interior Rearview Mirror.
3. Shift the transmission to Drive (engine not running)
4. With the scan tool, record and erase DTCs.
5. Turn the drivers side turn signal on.
6. Fold And Unfold the mirrors several time, if equipped with folding mirrors.
7. Turn the rear defogger on, if equipped with heated mirror.
8. Turn the park lamps on.
9. Press and release the Mirror Select switch to select the Driver Outside Rearview Mirror.
10. Operate the Mirror Adjust switch in all directions several times while monitoring the scan tool for DTCs. NOTE: After adjusting the mirror in one direction wait at least two seconds before adjusting the mirror in the opposite direction, as this will allow time for an active fault to set if present.

11. With the scan tool, read DTCs. NOTE: Check for a change in DTCs.

Does the scan tool display; B1F05-13-ELECTROCHROMATIC CONTROL CIRCUIT - CIRCUIT OPEN as active?

Yes

- With the circuit now OPEN that indicates the short is NOT in the Module. Replace the mirror. Service and Repair
- Perform the BODY VERIFICATION TEST. Body Verification Test

No

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