Diagnostic Test

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
3. Press and release the Mirror Select switch to select the Driver Outside Rearview Mirror.
4. Operate the Mirror Adjust switch in all directions several times.
5. Turn the ignition from on to off three times.
6. Turn the ignition on.
7. With the scan tool, read DDM DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - The conditions that caused this code to set are not present at this time. Use the wiring diagram/schematic as a guide and inspect the wiring and connectors.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (P75) DRIVER MIRROR HORIZONTAL DRIVER CIRCUIT FOR AN OPEN
1. Turn the ignition off.
2. Disconnect the Driver Door Module C4 harness connector.
3. Using a 12 volt test light, backprobe and connect one lead to the (P75) Driver Mirror Horizontal Driver circuit and the other lead to the (P73) Driver Mirror Common Driver circuit in the Driver Door Module (Outside Rearview Mirror (Component Side)) C2 connector.
4. While moving the mirror adjust switch left and right, observe the test light.
  Does the test light illuminate brightly when the switch is moved in either direction?
  
  Yes
  - Examine and repair the mirror harness for any breaks or damage. If the wiring harness and connector are okay, replace the Outside Rearview Mirror Assembly in accordance with the Service Information. Refer to OUTSIDE REARVIEW MIRROR, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 3
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all DDM harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
5. Connect all DDM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Connect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Connect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
10. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Examine and repair the mirror harness for any breaks or damage. If the wiring harness and connector are okay, replace the Outside Rearview Mirror Assembly in accordance with the Service Information. Refer to OUTSIDE REARVIEW MIRROR, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Replace the Driver Door Module in accordance with Service Information. Refer to MODULE, DOOR (DDM/PDM), REMOVAL .
    Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .