Diagnostic Instructions
DTC Descriptors
DTC B1600: Mirror Motor 1 (vertical) Circuit
DTC B1605: Mirror Motor 2 (horizontal) Circuit
Circuit/System Description
The driver door module (DDM) and passenger door module (PDM) each provide motor control output functions for their respective mirrors. These output controls allow each door module to command their respective power mirrors in horizontal and vertical positions.
The driver door switch assembly (DDSA) sends a serial data message to the door modules when the mirror switch is activated to the up, down, left or right positions. When the door modules detect an active mirror command from the DDSA, they will command the respective
mirror motor in the appropriate direction. Each door module commands their respective mirror motors by applying a ground or voltage to the control circuit, depending on the desired mirror position. For more detailed information concerning power mirror operation
refer to
Outside Mirror Description and Operation
.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | The DDM or PDM detects a short to ground or voltage in the mirror motor control circuit. |
| • | Condition must be present for 2 seconds. |
Actions Taken When the DTC Sets
| • | When DTC B1600 is present, the vertical mirror control will be disabled. |
| • | When DTC B1605 is present, the horizontal mirror control will be disabled. |
Conditions for Clearing the DTC
| • | The condition responsible for setting the DTC no longer exists. |
| • | You issue a scan tool CLEAR DTCs command. |
Diagnostic Aids
The following conditions may cause an intermittent malfunction:
| • | There is an intermittent short to ground or voltage in a mirror motor control circuit. |
| • | A mirror motor is shorted internally. |
Reference Information
Schematic Reference
Outside Rearview Mirror Schematics
Connector End View Reference
Mirror Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Ignition OFF, disconnect the appropriate outside rearview mirror C1 harness connector.
- Ignition OFF, test for less than 1.0 ohm of resistance at each mirror motor control circuit between the outside rearview mirror C1 harness connector and ground.
| ⇒ | If greater than the specified range, test the appropriate mirror motor control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the appropriate door control module. |
- Connect a test lamp between mirror motor UP control circuit terminal A and mirror motor DOWN control circuit terminal C.
- Command the appropriate mirror to the UP and DOWN positions with a scan tool. The test lamp should turn ON when commanding the Up and DOWN states.
| ⇒ | If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuit tests normal, replace the appropriate door control module. |
- Connect a test lamp between mirror motor LEFT control circuit terminal H and mirror motor RIGHT control circuit terminal F.
- Command the appropriate mirror to the LEFT and RIGHT positions with a scan tool. The test lamp should turn ON when commanding the LEFT and RIGHT states.
| ⇒ | If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuit tests normal, replace the appropriate door control module. |
- If all circuits test normal, test or replace the appropriate mirror.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
