Pinpoint Test A: The Mirrors Are Inoperative
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
Test Step
- A1 CHECK FOR POWER TO EXTERIOR MIRROR CONTROL SWITCH
- Disconnect: Exterior Mirror Control Switch C527.
- Measure the voltage at exterior mirror control switch C527 pin 1, circuit 956 (OG/LG) harness side and ground.
- Is the voltage greater than 10 volts?
Result / Action to Take
- Yes : GO to A2.
- No : REPAIR the circuit. TEST the system for normal operation.
- A2 CHECK CIRCUIT 542 (YE) FOR SHORT TO GROUND
- Measure the resistance to ground at the exterior mirror control switch C527 pin 6, circuit 542 (YE) harness side and ground.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to A3.
- No : REPAIR the circuit. TEST the system for normal operation.
- A3 CHECK CIRCUIT 542 (YE) FOR AN OPEN
- Disconnect: LH Exterior Mirror C521.
- Measure the resistance between exterior mirror control switch C527 pin 6, circuit 542 (YE) and LH exterior mirror C521 pin 2, circuit 542 (YE) harness side.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to A4.
- No : REPAIR the circuit. TEST the system for normal operation.
- A4 CHECK THE EXTERIOR MIRROR CONTROL SWITCH GROUND
- Measure the resistance to ground at exterior mirror control switch C527 pin 5, circuit 57 (BK) harness side and ground.
- Is the resistance less than 5 ohms?
- Yes : INSTALL a new exterior mirror control switch. TEST the system for normal operation.
- No : REPAIR the circuit. TEST the system for normal operation.