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Home >> Ford >> 1999 >> Taurus SHO >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Power Mirror System >> System Tests >> Test C: Single Mirror Does Not Operate With Switch Logic
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Test C: Single Mirror Does Not Operate With Switch Logic

  1. Turn ignition switch to LOCK position. Disconnect malfunctioning outside mirror harness connector. Inspect wiring. Ensure wires are connected to proper terminals. See WIRE/TERMINAL IDENTIFICATION  table. See Figure . If wires are not damaged and properly connected, go to next step. If wires are damaged and/or connected improperly, repair as necessary.
    WIRE/TERMINAL IDENTIFICATION

    Mirror Terminal No. Wire Color
    Driver's Side
    7 Red
    5 Yellow
    6 Dark Blue
    Passenger's Side
    6 Violet
    5 Yellow
    7 White
  2. Measure voltage/resistance at appropriate terminal at malfunctioning outside mirror harness connector while operating mirror control switch to appropriate position. See MIRROR LOGIC VOLTAGE TEST  table. If voltage/resistance readings are not as specified, go to next step. If voltage/resistance readings are as specified, replace appropriate outside mirror.
    MIRROR LOGIC VOLTAGE TEST

    Terminal No. (Wire Color) Switch Position Value
    Driver's Side
    5 (Yellow) Left/Up Battery Voltage
    5 (Yellow) Down/Right Ground
    6 (Dark Blue) Down Battery Voltage
    6 (Dark Blue) Up Ground
    7 (Red) Right Battery Voltage
    7 (Red) Left Ground
    Passenger's Side
    5 (Yellow) Left/Up Battery Voltage
    5 (Yellow) Down/Right Ground
    6 (Violet) Down Battery Voltage
    6 (Violet) Up Ground
    7 (White) Right Battery Voltage
    7 (White) Left Ground
  3. Remove mirror control switch leaving harness connected. Using a DVOM, backprobe at appropriate terminal at mirror control switch harness connector C518 while operating switch in appropriate position. See SWITCH LOGIC VOLTAGE TEST  table. If voltage/resistance readings are as specified, repair crossed wires. If voltage/resistance readings are not as specified, replace mirror control switch.
    SWITCH LOGIC VOLTAGE TEST

    Terminal No. (Wire Color) Switch Position Value
    Driver's Side
    3 (Red) Right Battery Voltage
    3 (Red) Left Ground
    6 (Yellow) Left/Up Battery Voltage
    6 (Yellow) Down/Right Ground
    8 (Dark Blue) Down Battery Voltage
    8 (Dark Blue) Up Ground
    Passenger's Side
    4 (White) Right Battery Voltage
    4 (White) Left Ground
    6 (Yellow) Left/Up Battery Voltage
    6 (Yellow) Down/Right Ground
    7 (Violet) Down Battery Voltage
    7 (Violet) Up Ground
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