Pinpoint Test C: A Single Mirror Does Not Operate Correctly

Rear View Mirrors - Exterior

Pinpoint Test C: A Single Mirror Does Not Operate Correctly

Normal Operation

Under normal operation, the exterior mirror control switch uses circuits CPM16 (BN/BU), CPM17 (BU/GN), CPM20 (BN/WH), CPM21 (YE/VT) and CPM23 (GY) to control the exterior mirror motor movement. The exterior mirror switch controls the LH exterior mirror motor movement by switching voltage and ground to circuits CPM16 (BN/BU), CPM17 (BU/GN) and CPM23 (GY). The exterior mirror switch controls the RH exterior mirror motor movement by switching voltage and ground to circuits CPM20 (BN/WH), CPM21 (YE/VT) and CPM23 (GY).

Mirror Movement

- When the LH/RH exterior mirror motor receives ground through circuit CPM16 (BN/BU)/CPM20 (BN/WH) and voltage through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate leftward.

- When the LH/RH exterior mirror motor receives voltage through circuit CPM16 (BN/BU)/CPM20 (BN/WH) and ground through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate rightward.

- When the LH/RH exterior mirror motor receives ground through circuit CPM17 (BU/GN)/CPM21 (YE/VT) and voltage through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate downward.

- When the LH/RH exterior mirror motor receives voltage through circuit CPM17 (BU/GN)/CPM21 (YE/VT) and ground through circuit CPM23 (GY), the LH/RH exterior mirror motor will operate upward.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Exterior mirror control switch

- Exterior mirror motor (aero mirrors only)

- Exterior mirror

PINPOINT TEST C : A SINGLE MIRROR DOES NOT OPERATE CORRECTLY

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1 CHECK THE MIRROR MOVEMENT (RIGHT/LEFT)

- Operate the RH and LH exterior mirrors in the right and left direction using the exterior mirror control switch.

Do the exterior mirrors move left and right?

Yes
GO to C2.

No
GO to C3.

C2 CHECK THE MIRROR MOVEMENT (UP/DOWN)

- Operate the RH and LH exterior mirrors in the up and down direction using the exterior mirror control switch.

Do the exterior mirrors move up and down?

Yes
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. TEST the system for normal operation.

No
GO to C4.

C3 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR (RIGHT/LEFT)

- Ignition OFF.

- Disconnect: Inoperative Exterior Mirror C521 (LH) or C601 (RH).

- Ignition ON.

- NOTE: Position the exterior mirror control switch to the LH or RH mirror position.

While operating the exterior mirror control switch in the rightward position, measure the voltage between ground and exterior mirror:
- LH exterior mirror:C521-1, circuit CPM16 (BN/BU), harness side.

- RH exterior mirror:C601-1, circuit CPM20 (BN/WH), harness side.

Is the voltage greater than 10 volts?

Yes

Trailer tow mirrors: INSTALL a new LH or RH exterior mirror. REFER to Exterior Mirror - Aero, Trailer Tow Exterior Mirror - Aero, Trailer Tow. TEST the system for normal operation.

Aero mirrors: CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the LH or RH exterior mirror motor for open circuits, and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new LH or RH mirror. REFER to Exterior Mirror - Aero, Trailer Tow Exterior Mirror - Aero, Trailer Tow. If the jumper harness is OK, INSTALL a new LH or RH exterior mirror motor. REFER to Exterior Mirror Motor - Aero Service and Repair. TEST the system for normal operation.

No
GO to C5.

C4 CHECK THE VOLTAGE TO THE INOPERATIVE MIRROR (UP/DOWN)

- Disconnect: Inoperative Exterior Mirror C521 (LH) or C601 (RH).

- Ignition ON.

- NOTE: Position the exterior mirror control switch to the LH or RH mirror position.

While operating the exterior mirror control switch in the upward position, measure the voltage between ground and exterior mirror:
- LH exterior mirror:C521-3, circuit CPM17 (BU/GN), harness side.

- RH exterior mirror:C601-3, circuit CPM21 (YE/VT), harness side.

Is the voltage greater than 10 volts?

Yes

Trailer tow mirrors: INSTALL a new LH or RH exterior mirror. REFER to Exterior Mirror - Aero, Trailer Tow Exterior Mirror - Aero, Trailer Tow. TEST the system for normal operation.

Aero mirrors: CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the LH or RH exterior mirror motor for open circuits, and damaged or pushed-out pins. If the jumper harness is not OK, REPAIR the jumper harness. If the jumper harness cannot be repaired, INSTALL a new LH or RH mirror. REFER to Exterior Mirror - Aero, Trailer Tow Exterior Mirror - Aero, Trailer Tow. If the jumper harness is OK, INSTALL a new LH or RH exterior mirror motor. REFER to Exterior Mirror Motor - Aero Service and Repair. TEST the system for normal operation.

No
GO to C6.

C5 CHECK CIRCUIT CPM16 (BN/BU) OR CPM20 (BN/WH) FOR AN OPEN

- Ignition OFF.

- Disconnect: Exterior Mirror Control Switch C527.

- LH exterior mirror: Measure the resistance between exterior mirror control switch C527-8, circuit CPM16 (BN/BU), harness side and LH exterior mirror C521-1, circuit CPM16 (BN/BU), harness side.

- RH exterior mirror: Measure the resistance between exterior mirror control switch C527-7, circuit CPM20 (BN/WH), harness side and RH exterior mirror C601-1, circuit CPM20 (BN/WH), harness side.

Is the resistance less than 5 ohms?

Yes
INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch Service and Repair. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.

C6 CHECK CIRCUIT CPM17 (BU/GN) OR CPM21 (YE/VT) FOR AN OPEN

- Ignition OFF.

- Disconnect: Exterior Mirror Control Switch C527.

- LH exterior mirror: Measure the resistance between exterior mirror control switch C527-5, circuit CPM17 (BU/GN), harness side and LH exterior mirror C521-3, circuit CPM17 (BU/GN), harness side.

- RH exterior mirror: Measure the resistance between exterior mirror control switch C527-2, circuit CPM21 (YE/VT), harness side and RH exterior mirror C601-3, circuit CPM21 (YE/VT), harness side.