2003 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

Power Mirror Control System: Inspection

  1. INSPECT OUTER MIRROR SWITCH ASSY (w/o RETRACT MIRROR) 
    1. The L side of the left/right adjustment switch:

      Inspect the mirror switch continuity.

      Standard (Left side): 

      OUTER MIRROR SWITCH ASSY (W/O RETRACT MIRROR) LH TERMINAL POSITION CHART

      Terminal No. Switch Position Specified Condition
      - OFF No continuity
      1 <=> 8 UP Continuity
      3 <=> 4
      7 <=> 8
      1 <=> 8 DOWN Continuity
      3 <=> 8
      4 <=> 7
      1 <=> 8 LEFT Continuity
      4 <=> 9
      7 <=> 8
      1 <=> 8 RIGHT Continuity
      4 <=> 7
      8 <=> 9
      Fig 1: Inspecting Outer Mirror Switch Assy
      G03373555Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If the result is not as specified, replace the switch assy.

    2. The R side of the left/right adjustment switch:

      Inspect the mirror switch continuity.

      Standard (Right side): 

      OUTER MIRROR SWITCH ASSY (W/O RETRACT MIRROR) RH TERMINAL POSITION CHART

      Terminal No. Switch Position Specified Condition
      - OFF No continuity
      1 <=> 8 UP Continuity
      2 <=> 4
      7 <=> 8
      1 <=> 8 DOWN Continuity
      2 <=> 8
      4 <=> 7
      1 <=> 8 LEFT Continuity
      7 <=> 8
      4 <=> 10
      1 <=> 8 RIGHT Continuity
      4 <=> 7
      8 <=> 10

      If the result is not as specified, replace the switch assy.

    3. When the left/right adjustment switch is off:

      Inspect the mirror switch continuity.

      Standard (Adjustment switch off): 

      (ADJUSTMENT SWITCH OFF) SWITCH TERMINAL POSITION CHART

      Terminal No. Switch Position Specified Condition
      7 <=> 8 UP Continuity
      4 <=> 7 DOWN Continuity
      7 <=> 8 LEFT Continuity
      4 <=> 7 RIGHT Continuity

      If the result is not as specified, replace the switch assy.

    4. Inspect operation of the mirror switch illumination.

      Standard: 

      MIRROR SWITCH ILLUMINATION TERMINAL SPECIFIED CONDITION CHART

      Measurement Condition Specified Condition
      Battery positive (+) --> ILL+ (5) Battery negative (-) --> ILL- (6) Illumination light lights up

      If the result is not as specified, replace the switch assy or bulb.

      Fig 2: Inspecting Operation Of Mirror Switch Illumination
      G03373556Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT OUTER REAR VIEW MIRROR ASSY LH 
    1. Disconnect the mirror connector.
    2. Apply battery voltage and inspect operation of the mirror face, as shown in the table and illustration.

      Standard (LH): 

      OUTER REAR VIEW MIRROR ASSY LH MEASUREMENT CONDITION CHART

      Measurement Condition Mirror Operation
      Battery positive (+) --> MV (7)
      Battery negative (-) --> M+ (6)      		 Turns upward (A)
      Battery positive (+) --> M+ (6)
      Battery negative (-) --> MV (7)      		 Turns downward (B)
      Battery positive (+) --> M+ (8)
      Battery negative (-) --> MH (7)      		 Turns left (C)
      Battery positive (+) --> MH (7)
      Battery negative (-) --> M+ (8)      		 Turns right (D)

      If the result is not as specified, replace the mirror assy.

      Fig 3: Identifying Outer Rear View Mirror Assy LH Connector Terminal
      G03373557Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT OUTER REAR VIEW MIRROR ASSY LH (w/ SEAT MEMORY SWITCH) 
    1. Disconnect the mirror connector.
    2. Apply battery voltage and inspect operation of the mirror face, as shown in the table and illustration.

      Standard (LH): 

      OUTER REAR VIEW MIRROR ASSY LH (W/ SEAT MEMORY SWITCH) MEASUREMENT CONDITION CHART

      Measurement Condition Mirror Operation
      Battery positive (+) --> MV (7)
      Battery negative (-) --> M+ (6)      		 Turns upward (A)
      Battery positive (+) --> M+ (6)
      Battery negative (-) --> MV (7)      		 Turns downward (B)
      Battery positive (+) --> M+ (8)
      Battery negative (-) --> MH (7)      		 Turns left (C)
      Battery positive (+) --> MH (7)
      Battery negative (-) --> M+ (8)      		 Turns right (D)

      If the result is not as specified, replace the mirror assy.

    3. Inspect operation of the mirror position sensor.
      1. Connect the positive (+) lead from the ohmmeter to terminal 9 and the negative (-) lead to terminal 15, and measure the resistance.

        Standard: 700-1300 Ω 

        Fig 4: Identifying Outer Rear View Mirror Assy LH Connector Terminal
        G03373558Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Check that the resistance between terminals 9 and 10 changes when slowly turning the mirror face right and left.
      3. Check that the resistance between terminals 9 and 16 changes when slowly turning the mirror face right and left.
  4. INSPECT OUTER REAR VIEW MIRROR ASSY RH 
    1. Disconnect the mirror connector.
    2. Apply battery voltage and inspect operation of the mirror face, as shown in the table and illustration.

      Standard (RH): 

      OUTER REAR VIEW MIRROR ASSY RH MEASUREMENT CONDITION CHART

      Measurement Condition Mirror Operation
      Battery positive (+) --> MV (7)
      Battery negative (-) --> M+ (6)      		 Turns upward (A)
      Battery positive (+) --> M+ (6)
      Battery negative (-) --> MV (7)      		 Turns downward (B)
      Battery positive (+) --> M+ (8)
      Battery negative (-) --> MH (7)      		 Turns left (C)
      Battery positive (+) --> MH (7)
      Battery negative (-) --> M+ (8)      		 Turns right (D)

      If the result is not as specified, replace the mirror assy.

      Fig 5: Identifying Outer Rear View Mirror Assy RH Connector Terminal
      G03373559Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT OUTER REAR VIEW MIRROR ASSY RH (w/ SEAT MEMORY SWITCH) 
    1. Disconnect the mirror connector.
    2. Apply battery voltage and inspect operation of the mirror face, as shown in the table and illustration.

      Standard (RH): 

      OUTER REAR VIEW MIRROR ASSY RH (W/ SEAT MEMORY SWITCH) MEASUREMENT CONDITION CHART

      Measurement Condition Mirror Operation
      Battery positive (+) --> MV (7)
      Battery negative (-) --> M+ (6)      		 Turns upward (A)
      Battery positive (+) --> M+ (6)
      Battery negative (-) --> MV (7)      		 Turns downward (B)
      Battery positive (+) --> M+ (8)
      Battery negative (-) --> MH (7)      		 Turns left (C)
      Battery positive (+) --> MH (7)
      Battery negative (-) --> M+ (8)      		 Turns right (D)

      If the result is not as specified, replace the mirror assy.

    3. Inspect operation of the mirror position sensor.
      1. Connect the positive (+) lead from the ohmmeter to terminal 9 and the negative (-) lead to terminal 15, and measure the resistance.
        Fig 6: Identifying Outer Rear View Mirror Assy RH Connector Terminal
        G03373560Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard: 

        700-1300 Ω 

      2. Check that the resistance between terminals 9 and 10 changes when slowly turning the mirror face right and left.
      3. Check that the resistance between terminals 9 and 16 changes when slowly turning the mirror face right and left.
  6. INSPECT SEAT MEMORY SWITCH (w/ SEAT MEMORY SWITCH) 
    1. Inspect the seat memory switch continuity.

      Standard: 

      SEAT MEMORY SWITCH MEASUREMENT CONDITION CHART

      Terminal No. Switch Position Specified Condition
      1 <=> 2 SET Switch ON Continuity
      2 <=> 3 SW1 Switch ON Continuity
      2 <=> 4 SW2 Switch ON Continuity

      If the result is not as specified, replace the switch assy.

      Fig 7: Identifying Seat Memory Switch Connector Terminal
      G03373561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT OUTER MIRROR CONTROL ECU ASSY 
    1. Disconnect the connector from the mirror control ECU assy.
    2. Check the voltage or continuity of each terminal of the wire harness side connector.

      Standard: 

      OUTER MIRROR CONTROL ECU ASSY SWITCH TERMINAL POSITION CHART

      Terminal No. Switch Position Specified Condition
      1 <=> Body ground Constant 10-14V
      2 <=> Body ground Ignition switch
      OFF --> ACC      		 0V --> 10-14V
      14 <=> Body ground Constant Continuity
      15 <=> Body ground Shift position
      P --> R      		 0V --> 10 --14 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

      Fig 8: Identifying Outer Mirror Control ECU Assy Connector Terminal
      G03373562Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect the connector to the mirror control ECU assy.
    4. Check the voltage or continuity of each terminal of the wire harness side connector.
      Fig 9: Identifying Outer Mirror Control ECU Assy Connector Terminal
      G03373563Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      OUTER MIRROR CONTROL ECU ASSY SWITCH TERMINAL POSITION CHART

      Terminal No. Switch Position Specified Condition
      10 <=> Body ground Ignition switch ACC, Left/right adjustment switch L side, Mirror switch OFF --> RIGHT or DOWN 0V --> 8 V or more
      11 <=> Body ground Ignition switch ACC, Left/right adjustment switch L side, Mirror switch OFF --> LEFT 0V --> 8 V or more
      12 <=> Body ground Ignition switch ACC, Left/right adjustment switch L side, Mirror switch OFF --> UP 0V --> 8 V or more
      22 <=> Body ground Ignition switch ACC, Left/right adjustment switch R side, Mirror switch OFF --> RIGHT or DOWN 0V --> 8 V or more
      23 <=> Body ground Ignition switch ACC, Left/right adjustment switch R side, Mirror switch OFF --> LEFT 0V --> 8 V or more
      24 <=> Body ground Ignition switch ACC, Left/right adjustment switch R side, Mirror switch OFF --> UP 0V --> 8 V or more

      If the result is not as specified, replace the mirror assy.

      Standard: 

      OUTER MIRROR CONTROL ECU ASSY SWITCH TERMINAL POSITION CHART

      Terminal No. Switch Position Specified Condition
      8 <=> Body ground Ignition switch ACC, Left/right adjustment switch L side, Mirror switch innermost --> Outermost Approx 4 V --> 0.23 V
      9 <=> Body ground Ignition switch ACC, Left/right adjustment switch L side, Mirror switch uppermost --> Lowermost Approx 3.7 V --> 0.27 V
      20 <=> Body ground Ignition switch ACC, Left/right adjustment switch L side, Mirror switch innermost --> Outermost Approx 4 V --> 0.23 V
      21 <=> Body ground Ignition switch ACC, Left/right adjustment switch R side, Mirror switch uppermost --> Lowermost Approx 3.7 V --> 0.27 V
      13 <=> Body ground Ignition switch OFF, All lights OFF, All doors closed and left untouched for 30 sec. or more --> Any door open No Hz output (0 Hz) --> Hz output
      25 <=> Body ground Ignition switch OFF, All light OFF, All doors closed and left untouched for 30 sec. or more --> Any door open No Hz output (0 Hz) --> Hz output

      If the result is not as specified, replace the mirror assy or the multiplex control may malfunction.

      Standard: 

      OUTER MIRROR CONTROL ECU ASSY SWITCH TERMINAL POSITION CHART

      Terminal No. Switch Position Specified Condition
      7 <=> Body ground Ignition switch OFF --> ACC 0V --> 5V

      If the result is not as specified, replace the mirror control ECU assy

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