Ford Mustang (1999-2004) Service Manual: Rear View Mirrors (Diagnosis and Testing)

Refer to Wiring Diagrams Cell 124 , Power Mirrors for schematic and connector information.

Special Tool(s)

	73III Automotive Meter 105-R0057 or equivalent
	Flex Probe Kit 105-R025B or equivalent

Inspection and Verification

1. Verify the customer concern by operating the system.

2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical	Electrical
Exterior rear view mirrors Interior rear view mirror	Central junction box (CJB) fuse 19 (15A) Wiring harness Connections Exterior rear view mirror control Exterior rear view mirror moto

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4. If the concern is not visually evident, verify the symptom and refer to the Symptom Chart.

Symptom Chart

Refer to the Wiring Diagrams for connector numbers stated in the pinpoint tests.

Condition	Possible Sources	Action
The mirrors are inoperative	Exterior rear view mirror control. Central junction box (CJB) fuse 19 (15A). Circuitry.	Go To Pinpoint Test A
A single mirror is inoperative	Exterior rear view mirror control. Exterior rear view mirror motor. Circuitry.	Go To Pinpoint Test B .
A single mirror does not function with switch logic	Exterior rear view mirror control. Exterior rear view mirror motor. Circuitry.	Go To Pinpoint Test C .

Pinpoint Tests

PINPOINT TEST A: THE MIRRORS ARE INOPERATIVE

Test Step

Result / Action to Take

A1 CHECK CIRCUIT 326 (WH/VT)

Yes

GO to A2 .

REPAIR the circuit.

TEST the system for normal operation.

Disconnect: Exterior Rear View Mirror Control C527.
Measure the voltage between exterior rear view mirror control C527 pin 1, circuit 326 (WH/VT), harness side and ground.

Is the voltage greater than 10 volts?

A2 CHECK CIRCUIT 1205 (BK) FOR AN OPEN

Yes

GO to A3 .

REPAIR the circuit.

TEST the system for normal operation.

Measure the resistance between exterior rear view mirror control C527 pin 5, circuit 1205 (BK), harness side and ground.

Is the resistance less than 5 ohms?

A3 CHECK CIRCUIT 542 (YE) FOR AN OPEN

Yes

INSTALL a new exterior rear view mirror control.

REFER to Switch- Exterior Rear View Mirror Control in this section.

REPAIR the circuit.

TEST the system for normal operation.

Measure the resistance between passenger exterior rear view mirror C622 pin C, circuit 542 (YE), harness side and exterior rear view mirror control C527 pin 6, circuit 542 (YE), harness side.

Is the resistance less than 5 ohms?

PINPOINT TEST B: A SINGLE MIRROR IS INOPERATIVE

Test Step

Result / Action to Take

B1 CHECK THE COMMON FEED INPUT

Yes

GO to B3 .

GO to B2 .

Disconnect: Exterior Rear View Mirror C516 (Driver) C622 (Passenger).
Disconnect the inoperative exterior rear view mirror C516 driver side or C622 passenger side.
Measure the voltage between driver exterior rear view mirror C516 pin C, circuit 542 (YE), harness side and ground; or between passenger exterior rear view mirror C622 pin C, circuit 542 (YE), harness side and ground

Select the inoperative side and actuate the exterior rear view mirror control to the down position, then the right position.
Are the voltages greater than 10 volts?

B2 CHECK CIRCUIT 542 (YE) FOR AN OPEN

Yes

INSTALL a new exterior rear view mirror control.

REFER to Switch- Exterior Rear View Mirror Control in this section. TEST the system for normal operation.

REPAIR the circuit.

TEST the system for normal operation.

Disconnect: Exterior Rear View Mirror Control C527.
Measure the resistance between exterior rear view mirror control C527 pin 6, circuit 542 (YE), harness side and driver exterior rear view mirror C516 pin C, circuit 542 (YE), harness side; or between exterior rear view mirror control C527 pin 6, circuit 542 (YE), harness side and passenger exterior rear view mirror C622 pin C, circuit 542 (YE), harness side.

Is the resistance less than 5 ohms?

B3 CHECK THE UP/DOWN INPUT

Yes

GO to B6 .

GO to B4 for driver inoperative or GO to B5 for passenger inoperative.

Measure the voltage between driver exterior rear view mirror C516 pin B, circuit 541(DB), harness side and ground; or between passenger exterior rear view mirror C622 pin A, circuit 544 (VT), harness side and ground.

Actuate the exterior rear view mirror control to the up position.
Are the voltages greater than 10 volts?

B4 CHECK CIRCUIT 541 (DB) FOR AN OPEN

Yes

INSTALL a new exterior rear view mirror control.

REFER to Switch- Exterior Rear View Mirror Control in this section. TEST the system for normal operation.

REPAIR the circuit.

TEST the system for normal operation.

Disconnect: Exterior Rear View Mirror Control C527.
Measure the resistance between exterior rear view mirror control C527 pin 3, circuit 541 (DB), harness side and driver exterior rear view mirror C516 pin B, circuit 541 (DB), harness side.

Is the resistance less than 5 ohms?

B5 CHECK CIRCUIT 544 (VT) FOR AN OPEN

Yes

INSTALL a new exterior rear view mirror control.

REFER to Switch- Exterior Rear View Mirror Control in this section. TEST the system for normal operation.

REPAIR the circuit.

TEST the system for normal operation.

Disconnect: Exterior Rear View Mirror Control C527.
Measure the resistance between exterior rear view mirror control C527 pin 7, circuit 544 (VT), harness side and passenger exterior rear view mirror C622 pin A, circuit 544 (VT), harness side.

Is the resistance less than 5 ohms?

B6 CHECK THE LEFT/RIGHT INPUT

Yes

INSTALL a new exterior rear view mirror motor. REFER to Mirror-Motor in this section. TEST the system for normal operation.

GO to B7 for driver inoperative or GO to B8 for passenger inoperative.

Measure the voltage between driver exterior rear view mirror C516 pin A, circuit 540 (RD), harness side and ground; or between passenger exterior rear view mirror C622 pin B, circuit 543 (DG), harness side and ground.

Actuate the exterior rear view mirror control to the left position.
Is the voltage greater than 10 volts?

B7 CHECK CIRCUIT 540 (RD) FOR AN OPEN

Yes

INSTALL a new exterior rear view mirror control.

REFER to Switch- Exterior Rear View Mirror Control in this section. TEST the system for normal operation.

REPAIR the circuit.

TEST the system for normal operation.

Disconnect: Exterior Rear View Mirror Control C527.
Measure the resistance between exterior rear view mirror control C527 pin 4, circuit 540 (RD), harness side and driver exterior rear view mirror C516 pin A, circuit 540 (RD), harness side.

Is the resistance less than 5 ohms?

B8 CHECK CIRCUIT 543 (DG) FOR AN OPEN

Yes

INSTALL a new exterior rear view mirror control.

REFER to Switch- Exterior Rear View Mirror Control in this section. TEST the system for normal operation.

REPAIR the circuit.

TEST the system for normal operation.

Disconnect: Exterior Rear View Mirror Control C527.
Measure the resistance between exterior rear view mirror control C527 pin 8, circuit 543 (DG), harness side and passenger exterior rear view mirror C622 pin B, circuit 543 (DG), harness side.

Is the resistance less than 5 ohms?

PINPOINT TEST C: A SINGLE MIRROR DOES NOT FUNCTION WITH SWITCH LOGIC

Test Step	Result / Action to Take
C1 CHECK THE EXTERIOR REAR VIEW MIRROR LOGIC	Yes INSTALL a new exterior rear view mirror motor. REFER to Mirror-Motor in this section. TEST the system for normal operation. No GO to C2 .
Disconnect: Exterior Rear View MirrorC516 (Driver), or C622 (Passenger). Disconnect the suspect exterior rear view mirror C516 driver or C622 passenger. Measure for voltage or resistance at the suspect exterior rear view mirror harness side, while actuating the exterior rear view mirror control according to the following chart. Is the circuit logic OK?
C2 CHECK THE EXTERIOR REAR VIEW MIRROR CONTROL	Yes REPAIR the circuits. TEST the system for normal operation. No INSTALL a new exterior rear view mirror control. REFER to Switch-Exterior Rear View Mirror Control in this section. TEST the system for normal operation.
Remove the exterior rear view mirror control. Leave the harness connected. Measure for voltage or resistance at exterior rear view mirror control C527 while actuating the exterior rear view mirror control according to the following chart. Is the circuit logic OK?

Mirror - Power Exterior Rear View

Removal

1. Remove the door trim panel. For additional information, refer to Section.

2. Disconnect the power exterior rear view mirror electrical connector.

3. Remove the nuts and the power exterior rear view mirror.

Mirror - Power Exterior Rear View

Installation

1. To install, reverse the removal procedure.

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