DTC P1638 Cadillac
Lost Communication With Master Power Window Switch
Lost Communication With Master Power Window Switch
Description
When one or both door modules have lost communication with the Driver Express Window Door Lock Switch, this code will set.
Cause and Solution
FUSE M26 IN THE TIPM OPEN(A855) FUSED B(+) CIRCUIT OPEN(D903) LIN BUS CIRCUIT SHORT TO GROUND(D903) LIN BUS CIRCUIT SHORT TO VOLTAGE(D903) LIN BUS CIRCUIT OPEN(Q911) DRIVER WINDOW SWITCH SENSE RETURN CIRCUIT OPENDRIVER EXPRESS WINDOW DOOR LOCK SWITCHDOOR MODULE (DDM)
Video Guide
Diagnostic Info
- DTC Code: P1638
- Brand: Cadillac