Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Ignition OFF, disconnect the automatic transmission shift lever harness connector.
Ignition ON, verify with a scan tool the Tap Up/Down Switch parameter displays OFF in the Chassis Data list under BCM.
- If not the specified value
  Repair the short to ground in the 12 volt signal circuit. If the circuit tests normal, replace the BCM.
- If the specified value
Ignition ON, test for greater than 11 volts between the ignition voltage circuit terminal 4 and ground at the battery negative post.
- If less than the specified value
  Test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
- If greater than the specified value
Ignition OFF, test for 6.6-7.0 K ohms between terminal 3 and terminal 4 on the automatic transmission shift lever harness connector. Also, test for 3.7-4.2 K ohms when pressing the minus (-) switch and 1.7-2.0 K ohms when selecting the plus (+) switch.
- If not within the specified values
  Replace the automatic transmission shift lever.
- If within the specified value
Test the signal circuit between the BCM and the automatic transmission manual shift switch for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.