2008 Buick Enclave CXL 3.6L, V6 will not start will not crank

VEHICLE: 2008 Buick Enclave CXL 3.6L, V6, MFI, DOHC, VIN 7

MILEAGE: 37,000

Customer Concern: No start no crank.

No Electronic Control Module (ECM) communication.

Has Body Control Module (BCM) communication.

Ongoing body shop repairs.

Tests: 1. Key off, disconnect the scanner.

2. Check the resistance between pin 6 and 14 at the Data Link Connector (DLC). A value of 60
Ω +/- 10% is expected.

3. Disconnect the Electronic Control Module (ECM) at the radiator core support.

4. Check the resistance between pin 33 and 55 in the ECM Gray connector. A value of 60Ω +/- 10% is expected.

5. If the resistance is wrong, check for disconnected components or wiring and connection problems on the high speed GMLAN.

Potential Causes: Failed High Speed GMLAN

Confirmed Fix: Installed Headlight Control Module

Tech Tips: Note: Refer to wiring diagrams to decide options and early or late production.

The Headlamp Control Module is a part of the right headlight assembly.

 For additional help with your vehicle you can check out this automotive website. has some great information about most makes and model vehicles and is maintained daily