Pinpoint Test C: A Single Mirror Does Not Function With Switch Logic
Rear View Mirrors - Exterior
Pinpoint Tests
Pinpoint Test C: A Single Mirror Does Not Function With Switch Logic
Refer to Wiring Diagram Set 124, Power Mirrors for schematic and connector information. Diagrams By Number
Normal Operation
The exterior mirror control switch controls the LH exterior mirror movement by switching voltage and ground to circuits CPM14 (GY/BN), CPM16 (BN/BU) and CPM23 (GY). The exterior mirror switch controls the RH exterior mirror movement by switching voltage and ground to circuits CPM18 (GN/BN), CPM19 (GY/OG) and CPM23 (GY).
Mirror Movement
- When the LH/RH exterior mirror motor receives ground through circuit CPM16 (BN/BU)/CPM19 (GY/OG) and voltage through circuit CPM23 (GY), the LH/RH exterior mirror will operate leftward.
- When the LH/RH exterior mirror motor receives voltage through circuit CPM16 (BN/BU)/CPM19 (GY/OG) and ground through circuit CPM23 (GY), the LH/RH exterior mirror will operate rightward.
- When the LH/RH exterior mirror motor receives ground through circuit CPM14 (GY/BN)/CPM18 (GN/BN) and voltage through circuit CPM23 (GY), the LH/RH exterior mirror will operate downward.
- When the LH/RH exterior mirror motor receives voltage through circuit CPM14 (GY/BN)/CPM18 (GN/BN) and ground through circuit CPM23 (GY), the LH/RH exterior mirror will operate upward.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Exterior mirror control switch
- Exterior mirror motor
- Exterior mirror
PINPOINT TEST C: A SINGLE MIRROR DOES NOT FUNCTION WITH SWITCH LOGIC
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C1 CHECK THE EXTERIOR MIRROR CONTROL CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Exterior Mirror Control Switch C527.
- Ignition ON.
- Measure the voltage between ground and exterior mirror control switch:
- C527-2, circuit CPM18 (GN/BN), harness side.
- C527-5, circuit CPM14 (GY/BN), harness side.
- C527-6, circuit CPM23 (GY), harness side.
- C527-7, circuit CPM19 (GY/OG), harness side.
- C527-8, circuit CPM16 (BN/BU), harness side.
- Is any voltage present?
Yes
REPAIR the circuit(s). TEST the system for normal operation.
No
GO to C2.
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C2 CHECK THE EXTERIOR MIRROR CONTROL CIRCUITS FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Exterior Mirror C520 (LH) or C601 (RH).
- Measure the resistance between ground and exterior mirror control switch:
- C527-2, circuit CPM18 (GN/BN), harness side.
- C527-5, circuit CPM14 (GY/BN), harness side.
- C527-6, circuit CPM23 (GY), harness side.
- C527-7, circuit CPM19 (GY/OG), harness side.
- C527-8, circuit CPM16 (BN/BU), harness side.
- Are the resistances greater than 10,000 ohms?
Yes
GO to C3.
No
REPAIR the circuit(s). TEST the system for normal operation.
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C3 CHECK THE EXTERIOR MIRROR CONTROL CIRCUITS FOR AN OPEN
- LH exterior mirror: Measure the resistance between exterior mirror control switch:
- C527-5, circuit CPM14 (GY/BN), harness side and LH exterior mirror C520-1, circuit CPM14 (GY/BN), harness side.
- C527-6, circuit CPM23 (GY), harness side and LH exterior mirror C520-3, circuit CPM23 (GY), harness side.
- C527-8, circuit CPM16 (BN/BU), harness side and LH exterior mirror C520-7, circuit CPM16 (BN/BU), harness side.
- RH exterior mirror: Measure the resistance between exterior mirror control switch:
- C527-2, circuit CPM18 (GN/BN), harness side and RH exterior mirror C601-1, circuit CPM18 (GN/BN), harness side.
- C527-6, circuit CPM23 (GY), harness side and RH exterior mirror C601-3, circuit CPM23 (GY), harness side.
- C527-7, circuit CPM19 (GY/OG), harness side and RH exterior mirror C601-7, circuit CPM19 (GY/OG), harness side.
- Are the resistances less than 5 ohms?
Yes
CHECK the LH or RH exterior mirror jumper harness between the vehicle harness and the exterior mirror motor for open or shorted 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 exterior mirror. REFER to Exterior Mirror Exterior Mirror. If the jumper harness is OK, INSTALL a new LH or RH exterior mirror motor. REFER to Exterior Mirror Motor Service and Repair. TEST the system for normal operation.
No
REPAIR the circuit(s). TEST the system for normal operation.
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