Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For vehicles not equipped with K29F Front Seat Heater Control Module, K29FV Front Seat Heater Vent Control Module, K29R Rear Seat Heater Control Module, or K32 Heated Steering Wheel Module:

Ignore DTC U0208 if equipped with RPO 00V
Ignore DTC U0229 if equipped with RPO 00G
Ignore DTC U0247 if equipped with RPO 00R

Ignition ON/Vehicle In Service Mode.
Verify DTC U300D, P2534, P2535, U0073-U007E, or U100B is not set.
- If any of the DTCs are set
  Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Go to next step: If none of the DTCs are set
Determine the device that is not communicating. Refer to Control Module U Code List .
Refer to Data Link References to determine which data communication bus the non communicating device is on.
Verify DTC U0100-U02FF is not set.
- If the DTC is set and the non communicating device is on one of the CAN buses
  Refer to Circuit/System Testing - Testing a CAN Device .
- If the DTC is set and the non communicating device is on one of the LIN buses
  Refer to Circuit/System Testing - Testing a LIN Device .
- Go to next step: If the DTC is not set
A fault is currently not present and may be an intermittent condition.