Test V: The PRNDL Indicator Is Never/Always On (If Equipped)

PINPOINT TEST V: THE PRNDL INDICATOR IS NEVER/ALWAYS ON (IF EQUIPPED)

V1-V6:

V7-V8:

Normal Operation
The instrument cluster receives the transmission range status from the transmission control module (TCM) over the high speed controller area network (HS-CAN) communication bus. Column shift vehicles use a park detect switch (part of the brake shift interlock) to signal the instrument cluster that the shift lever is fully seated in the park position. The instrument cluster compares the park detect switch input with the transmission range status sent from the TCM. The instrument cluster provides a reference voltage to the brake shift interlock on circuit CET53 (BU/OG). When the gearshift is in PARK (P), the brake shift indicator routes the reference voltage to ground, pulling the circuit low to the instrument cluster. When the gearshift is moved out of PARK (P), the brake shift interlock opens the ground sending the reference voltage high. If the PRNDL information is missing from the TCM, the instrument cluster sets DTC U0101 or if the instrument cluster sees a signal from the park detect switch indicating the shifter is in PARK (P) with a conflicting PRNDL input, the instrument cluster defaults the PRNDL display to blank (no PRNDL display).

NOTE:
- If U0101 is set, other symptoms may include the O/D off indicator or the wrench reconfigurable telltale indicator ON.
- The PRNDL is only available on column shift vehicles.

DTC C1945 - is a continuous memory DTC that sets if the instrument cluster detects a short to ground on the park detect switch input, circuit CET53 (BU/OG), pulling the circuit low with a vehicle speed sensor (VSS) input over 16 km/h (10 mph), indicating that the vehicle is in motion.

Possible Causes
- Circuit CET53 (BU/OG) open or short to ground
- Brakeshift interlock
- Instrument cluster