Ford Falcon. Manual — part 415
501-09-7
Rear View Mirrors
501-09-7
DIAGNOSIS AND TESTING (Continued)
C94
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
1
Circuit 540A (R)
0 voltage, less than 5 ohms between power
mirror switch and left front mirror motor
2
Circuit 541 (L)
0 voltage, less than 5 ohms between power
Mirror x direction control
mirror switch and left front mirror motor
3
Circuit 544 (V)
0 voltage, less than 5 ohms between power
Mirror y direction control
mirror switch and left front mirror motor
C377
Pin Number(s)
Circuit Designation/Description
Normal Condition/Measurement
1
Circuit 540A (R)
0 voltage, less than 5 ohms between power
mirror switch and left front mirror motor
2
Circuit 541 (L)
0 voltage, less than 5 ohms between power
Mirror x direction control
mirror switch and left front mirror motor
3
Circuit 544 (V)
0 voltage, less than 5 ohms between power
Mirror y direction control
mirror switch and left front mirror motor
Pinpoint Tests
STANDARD MIRROR (NON MEMORY)
PINPOINT TEST A : THE MIRRORS ARE INOPERATIVE
Test Step
Result / Action to Take
A1
CHECK CIRCUIT 299 (V/R) FOR VOLTAGE
Disconnect Exterior Mirror Control Switch.
Yes
Go to A2.
Key in ON position.
No
Measure voltage between exterior mirror control switch Connector
REPAIR the circuit. TEST the system for normal
C88, Circuit 299 (V/R), harness side and ground.
operation.
Is the voltage greater than 10 volts?
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501-09-8
Rear View Mirrors
501-09-8
DIAGNOSIS AND TESTING (Continued)
Test Step
Result / Action to Take
A2
CHECK CIRCUIT 57 B/F (B) FOR AN OPEN
Measure the resistance between exterior mirror control switch
Yes
Connector C88, Circuit 57(B/F), harness side and ground.
Go to A3.
Is the resistance less than 5 ohms?
No
REPAIR the circuit. TEST the system for normal
operation.
A3
CHECK CIRCUIT 540 (R) FOR OPEN
Disconnect Inoperative Exterior Rear View Mirror/s C520.
Yes
INSTALL a new exterior mirror control switch.
Measure the resistance between inoperative rear view mirror
TEST the system for normal operation.
Connector (C86/C94/C377) and mirror control switch Connector C88,
Circuit 540 (R).
No
REPAIR the circuit. TEST the system for normal
Is the resistance less than 5 ohms?
operation.
PINPOINT TEST B : A SINGLE MIRROR IS INOPERATIVE
Test Step
Result / Action to Take
B1
CHECK CIRCUITS 541 (L) AND 544 (V) FOR VOLTAGE
Disconnect Inoperative Exterior Rear View Mirror Connector.
Yes
Go to A3.
Key in ON position.
No
Select the inoperative mirror on the exterior mirror control switch.
Go to B2.
Measure the voltage between the inoperative exterior rear view mirror
connector, harness side and ground while operating the exterior
mirror control switch to the specified direction.
Driver mirror
Passenger mirror
Mirror control
direction
C86 circuit 541
C94/C377 circuit
UP
541
C86 circuit 544
C94/C377 circuit
RIGHT
544
Are the voltages greater than 10 volts?
B2
CHECK FOR AN OPEN CIRCUIT
Key in OFF position.
Yes
INSTALL a new exterior mirror control switch.
Disconnect Exterior Mirror Control Switch C88.
TEST the system for normal operation.
Measure the resistance between the inoperative exterior rear view
No
mirror connector, harness side and exterior mirror control switch
REPAIR the suspect circuit. TEST the system
connector, harness side.
for normal operation.
Circuit
Driver
541 A (L)
544 A (V)
Passenger
544 B (V)
541 B (L)
Are all of the resistances less than 5 ohms?
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501-09-9
Rear View Mirrors
501-09-9
DIAGNOSIS AND TESTING (Continued)
Test Step
Result / Action to Take
B3
CHECK CIRCUIT 540 (R) FOR OPEN
Disconnect Inoperative Exterior Rear View Mirror/s.
Yes
INSTALL a new exterior rear view mirror. Refer
Measure the resistance between the inoperative exterior rear view
to Exterior Mirror in this section. TEST the
mirror connector, circuit 540 (R), harness side and exterior mirror
system for normal operation.
control switch C88, circuit 540 (R), harness side.
No
Is the resistance less than 5 ohms?
REPAIR the circuit. TEST the system for normal
operation.
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501-09-10
Rear View Mirrors
501-09-10
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST C : A SINGLE MIRROR DOES NOT FUNCTION WITH SWITCH LOGIC
Test Step
Result / Action to Take
C1
CHECK FOR THE CORRECT INPUT TO THE EXTERIOR REAR
VIEW MIRROR
Disconnect Inoperative Exterior Rear View Mirror.
Yes
INSTALL a new exterior rear view mirror. Refer
Key in ON position.
to Exterior Mirror in this section. TEST the
system for normal operation.
Select the inoperative exterior rear view mirror on the exterior mirror
control switch.
No
Measure the voltage or resistance between the suspect exterior rear
Go to C2.
view mirror connector, harness side and ground while operating the
exterior mirror control switch to the specified position. Refer to the
following chart:
Exterior
Circuit
Mirror
Measurement
mirror
control
Connector
position
Driver
C86
540 A
Down
Greater than
10 volts
C86
540 A
Up
Less than 50
ohms
C86
540 A
Right
Greater than
10 volts
C86
540 A
Left
Less than 50
ohms
Driver and Passenger
C86/C94/C377
541 A/B
Up
Greater than
10 volts
C86/C94/C377
541 A/B
Down
Less than 50
ohms
C86/C94/C377
541 A/B
Left
Greater than
10 volts
C86/C94/C377
541 A/B
Right
Less than 50
ohms
Passenger
C94/C377
540 B
Down
Greater than
10 volts
C94/C377
540 B
Up
Less than 50
ohms
C94/C377
544 B
Right
Greater than
10 volts
C94/C377
544 B
Left
Less than 50
ohms
Are the measurements as indicated?
G90852 en
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