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Circuit/System Testing

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  1. Ignition OFF, transmission in Park. Disconnect the automatic transmission shift lever electrical connector.
  2. Ignition OFF, test for less than 1 ohm between terminal 2 on the automatic transmission shift lever vehicle harness connector and ground at the battery negative post.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for greater than 11 volts on the signal circuit terminal 1 on the automatic transmission shift lever vehicle harness connector and ground at the battery negative post.
    • If not within the specified value, test the signal circuit for a short to ground or an open/high resistance. If all circuits test normal, replace the BCM.
  4. Ignition OFF, test for less than 3 ohms between terminal 1 and terminal 2 on the automatic transmission shift lever component harness connector while depressing the Tow/Haul switch button.
    • If greater than the specified value, replace the automatic transmission shift lever assembly.
  5. If all circuits test normal, replace the BCM.
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