Pinpoint Test A: The Mirrors Are Inoperative
Rear View Mirrors - Exterior
Pinpoint Tests
Pinpoint Test A: The Mirrors are Inoperative
Refer to Wiring Diagram Set 124, Power Mirrors for schematic and connector information. Diagrams By Number
Normal Operation
The exterior mirror control switch receives voltage at all times from the Central Junction Box (CJB). The exterior mirror control switch has only one ground circuit. The exterior mirrors share a common circuit for both up/down and right/left movement.
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Exterior mirror control switch
PINPOINT TEST A: THE MIRRORS ARE 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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A1 CHECK FOR VOLTAGE TO THE EXTERIOR MIRROR CONTROL SWITCH
- Ignition OFF.
- Disconnect: Exterior Mirror Control Switch C527.
- Ignition ON.
- Measure the voltage between exterior mirror control switch C527-6, circuit 29-AD12 (OG/YE), harness side and ground.
- Is the voltage greater than 10 volts?
Yes
GO to A2.
No
VERIFY the CJB fuse 131 (5A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation.
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A2 CHECK FOR GROUND TO THE EXTERIOR MIRROR CONTROL SWITCH
- Ignition OFF.
- Measure the resistance between exterior mirror control switch C527-4, circuit 31-AD12 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to A3.
No
REPAIR the circuit. TEST the system for normal operation.
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A3 CHECK COMMON CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON.
- Measure the voltage between exterior mirror control switch C527-3, circuit 32-AD1 (WH/RD), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit. TEST the system for normal operation.
No
GO to A4.
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A4 CHECK COMMON CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between exterior mirror control switch C527-3, circuit 32-AD1 (WH/RD), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to A5.
No
REPAIR the circuit. TEST the system for normal operation.
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A5 CHECK COMMON CIRCUIT FOR AN OPEN
- Disconnect: LH Exterior Mirror C520.
- Measure the resistance between exterior mirror control switch C527-3, circuit 32-AD1 (WH/RD), harness side and LH exterior mirror C520-1, circuit 32-AD6 (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 system for normal operation.
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