Range Selector Displays Incorrect Range

Range Selector Displays Incorrect Range

Range Selector Displays Incorrect Range:

Circuit Description

The TCM also communicates the park/neutral switch status to the BCM via serial data. The BCM uses this data to control the Electronic PRNDL display on the shifter. The BCM controls the LED's in the PRNDL display through 4 control circuits. The BCM has 8 DTCs for these 4 control circuits. These DTCs diagnose a shorted or an open for each circuit.

Diagnostic Aids

Refer to Transmission Range Switch Logic for valid combinations of switch signal circuits A, B, C and P.

Test Description

The numbers below refer to the step numbers on the diagnostic table.
4. By disconnecting the TR switch, the voltage path for all TR switch circuits would be removed and the TCM should recognize all circuits as open. The scan tool should display HIGH for all range signals.
5. This step tests the TR switch wiring for an open or short to ground from the TCM.
6. This step tests the TR switch wiring and the TCM by providing a voltage path through a fused jumper wire. When jumpered, the scan tool range signal A should change to LOW.
7. This step tests the TR switch wiring and the TCM by providing a voltage path through a fused jumper wire. When jumpered, the scan tool range signal B should change to LOW.
8. This step tests the TR switch wiring and the TCM by providing a voltage path through a fused jumper wire. When jumpered, the scan tool range signal C should change to LOW.

Step 1 - Step 5:

Step 6 - Step 12:

Step 13- Step 15: