Pinpoint Test B: A Single Mirror is Inoperative
Rear View Mirrors - Exterior
Pinpoint Tests
Pinpoint Test B: A Single Mirror is Inoperative
Refer to Wiring Diagram Set 124, Power Mirrors for schematic and connector information. Diagrams By Number
Normal Operation
The exterior mirror control switch uses circuit CPM23 (GY) as the common circuit for both exterior mirror up/down and right/left movement.
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 B: A SINGLE MIRROR IS INOPERATIVE
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.
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B1 CHECK THE LH EXTERIOR MIRROR
- Set the exterior mirror control switch to the LH mirror position.
- Use the exterior mirror control switch to operate the LH exterior mirror.
- Does the LH exterior mirror operate?
Yes
GO to B2.
No
GO to B4.
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B2 CHECK THE EXTERIOR MIRROR CONTROL SWITCH
- Ignition OFF.
- Disconnect: Exterior Mirror Control Switch C527.
- Carry out the Exterior Mirror Control Switch component test.
Refer to Power Mirror Switch for component testing.
- Did the exterior mirror control switch pass the component test?
Yes
GO to B3.
No
INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch Service and Repair. TEST the system for normal operation.
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B3 CHECK COMMON CIRCUIT FOR AN OPEN
- Disconnect: RH Exterior Mirror C601.
- Measure the resistance between exterior mirror control switch C527-6, circuit CPM23 (GY), harness side and RH exterior mirror C601-2, circuit CPM23 (GY), harness side.
- Is the resistance less than 5 ohms?
Yes
Trailer tow mirrors: INSTALL a new 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 RH exterior mirror jumper harness between the vehicle harness and the 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 RH mirror. REFER to Exterior Mirror - Aero, Trailer Tow Exterior Mirror - Aero, Trailer Tow. If the jumper harness is OK, INSTALL a new RH exterior mirror motor. REFER to Exterior Mirror Motor - Aero Exterior Mirror Motor - Aero. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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B4 CHECK THE EXTERIOR MIRROR CONTROL SWITCH
- Ignition OFF.
- Disconnect: Exterior Mirror Control Switch C527.
- Carry out the Exterior Mirror Control Switch component test.
Refer to Power Mirror Switch for component testing.
- Did the exterior mirror control switch pass the component test?
Yes
GO to B5.
No
INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch Service and Repair. TEST the system for normal operation.
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B5 CHECK COMMON CIRCUIT FOR AN OPEN
- Disconnect: LH Exterior Mirror C521.
- Measure the resistance between exterior mirror control switch C527-6, circuit CPM23 (GY), harness side and LH exterior mirror C521-2, circuit CPM23 (GY), harness side.
- Is the resistance less than 5 ohms?
Yes
Trailer tow mirrors: INSTALL a new LH 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 exterior mirror jumper harness between the vehicle harness and the LH 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 mirror. REFER to Exterior Mirror - Aero, Trailer Tow Exterior Mirror - Aero, Trailer Tow. If the jumper harness is OK, INSTALL a new LH exterior mirror motor. REFER to Exterior Mirror Motor - Aero Exterior Mirror Motor - Aero. TEST the system for normal operation.
No
REPAIR the circuit. TEST the system for normal operation.
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