2003 FORD MUSTANG Workshop Manual

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FORD MUSTANG 2003  Workshop Manual DESCRIPTION AND OPERATION 
Rear View Mirrors 
The rear view mirror system consists of the following components: 
�zexterior rear view mirror 
�z exterior rear view mirror control 
�z exterior rear vie

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FORD MUSTANG 2003  Workshop Manual DIAGNOSIS AND TESTING 
Rear View Mirrors 
Refer to Wiring Diagrams Cell 
124  , Power Mirrors for schematic and connector information. 
Inspection and Verification  1. Verify the customer concern by o

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FORD MUSTANG 2003  Workshop Manual Pinpoint Tests 
PINPOINT TEST A: THE MIRRORS ARE INOPERATIVE  �z
Central junction box 
(CJB) fuse 19 (15A). 
�z Circuitry. 
�z A single mirror is inoperative  �zExterior rear view 
mirror control. 
�z

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FORD MUSTANG 2003  Workshop Manual PINPOINT TEST B: A SINGLE MIRROR IS INOPERATIVE  �z
Measure the resistance between passenger exterior rear view 
mirror C622 pin C, circuit 542 (YE), harness side and exterior 
rear view mirror contro

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FORD MUSTANG 2003  Workshop Manual �z
Is the resistance less than 5 ohms?  No 
REPAIR the circuit. 
TEST the system for 
normal operation. 
B3 CHECK THE UP/DOWN INPUT 
�z
Measure the voltage between driver exterior rear view mirror C51

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FORD MUSTANG 2003  Workshop Manual �z
Is the resistance less than 5 ohms?  operation. 
No 
REPAIR the circuit. 
TEST the system for 
normal operation. 
B6 CHECK THE LEFT/RIGHT INPUT 
�z
Measure the voltage between driver exterior rear

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FORD MUSTANG 2003  Workshop Manual PINPOINT TEST C: A SINGLE MIRROR DOES NOT FUNCTION WITH 
SWITCH LOGIC  �z
Is the resistance less than 5 ohms?  operation. 
No 
REPAIR the circuit. 
TEST the system for 
normal operation. 
Test Step  R

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FORD MUSTANG 2003  Workshop Manual �z
Is the circuit logic OK?  Circuit  position  resistance 
Passenger 
543 
(DG)  Left  Greater than 10 volts 
543 
(DG)  Right  Less than 5 ohms 
544 
(VT)  Up  Greater than 10 volts 
544 
(VT)  Down