Pinpoint Test 19: The Grade Assist Indicator Is Never/Always On
PINPOINT TEST 19: THE GRADE ASSIST INDICATOR IS NEVER/ALWAYS ON
Normal Operation
The instrument cluster receives the grade assist signal from the PCM over the high speed controller area network (HS-CAN) communication bus. When the grade assist function is selected off, the PCM sends a message to the instrument cluster to illuminate the grade assist indicator. If the grade assist on/off message is missing or if the data is deemed invalid by the instrument cluster for more than 5 seconds, the instrument cluster sets DTC U0100 in continuous memory and defaults the grade assist indicator off.
NOTE:If DTC U0100 is set in the instrument cluster, other observable symptoms may be an inoperative speedometer, tachometer or odometer.
Possible Causes
- Transaxle concern
- PCM
- Instrument cluster
Diagnostic Procedure
