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Home >> Mercury >> 2009 >> Mariner Base, 2.5 7, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 140 (Rear View Mirror) >> Diagnostic Tests >> Rear View Mirrors >> Pinpoint Tests >> Pinpoint Test B: A Single Mirror is Inoperative

Pinpoint Test B: A Single Mirror is Inoperative

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

Refer to appropriate SYSTEM WIRING DIAGRAMS article, Power Mirrors for schematic and connector information.

Normal Operation 

The exterior mirror control switch is supplied voltage from the central junction box (CJB) through circuit 1523 (DG) and ground through circuit 57 (BK). The exterior mirror control switch activates the LH exterior mirror up and down positions by switching voltage and ground on circuits 940 (DB/OG) and 945 (YE/BK). The exterior mirror control switch activates the LH exterior mirror left and right positions by switching voltage and ground on circuits 942 (RD/OG) and 945 (YE/BK). The exterior mirror control switch activates the RH exterior mirror up and down positions by switching voltage and ground on circuits 943 (VT/OG) and 945 (YE/BK). The exterior mirror control switch activates the RH exterior mirror left and right positions by switching voltage and ground on circuits 944 (DG/OG) and 945 (YE/BK). The exterior mirror control switch must be in the appropriate (left or right) position for the desired mirror to operate.

This pinpoint test is intended to diagnose the following:

PINPOINT TEST B: A SINGLE MIRROR IS INOPERATIVE 

  1. B1 CHECK THE LH AND RH EXTERIOR MIRRORS  
    • Operate the exterior mirrors.
    • Does the LH exterior mirror operate?  
    1. YES  : Go to  B2.
    2. NO  : Go to  B4.
  2. B2 CHECK THE EXTERIOR MIRROR CONTROL SWITCH 
    • Disconnect: Exterior Mirror Control Switch C527
    • Carry out the Exterior Mirror Control Switch Component Test. Refer to appropriate COMPONENT TESTING article.
    • Did the exterior mirror control switch pass the component test? 
    1. YES  : Go to  B3.
    2. NO  : INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch . TEST the system for normal operation.
  3. B3 CHECK CIRCUIT 945 (YE/BK) FOR AN OPEN  
    • Key in OFF position.
    • Disconnect: RH Exterior Mirror C622
      • Fig 1: Measuring Resistance
      GF0046595Courtesy of FORD MOTOR CO.
    • Measure the resistance between exterior mirror control switch C527-7, circuit 945 (YE/BK) harness side and RH exterior mirror C622-2, circuit 945 (YE/BK) and the harness side.
    • Is the resistance less than 5 ohms?  
    1. YES  : CHECK the 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 exterior mirror. REFER to Exterior Mirror . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to Exterior Mirror Motor . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
  4. B4 CHECK THE EXTERIOR MIRROR CONTROL SWITCH 
    • Disconnect: Exterior Mirror Control Switch C527
    • Carry out the Exterior Mirror Control Switch Component Test. Refer to appropriate COMPONENT TESTING article.
    • Did the exterior mirror control switch pass the component test? 
    1. YES  : Go to  B5.
    2. NO  : INSTALL a new exterior mirror control switch. REFER to Exterior Mirror Control Switch . TEST the system for normal operation.
  5. B5 CHECK CIRCUIT 945 (YE/BK) FOR AN OPEN  
    • Key in OFF position.
    • Disconnect: LH Exterior Mirror C516
      • Fig 2: Measuring Resistance
      GF0046595Courtesy of FORD MOTOR CO.
    • Measure the resistance between exterior mirror control switch C527-7, circuit 945 (YE/BK) harness side and LH exterior mirror C516-2, circuit 945 (YE/BK) harness side.
    • Is the resistance less than 5 ohms?  
    1. YES  : CHECK the LH 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 exterior mirror. REFER to Exterior Mirror . If the jumper harness is OK, INSTALL a new exterior mirror motor. REFER to Exterior Mirror Motor . TEST the system for normal operation.
    2. NO  : REPAIR the circuit. TEST the system for normal operation.
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