Is the relay OK?
YES -
Go to step 39.
NO -
Replace the relay, and recheck.?
39. Remove the brake light relay.
40. Disconnect the ACC unit 20P connector.
41. Disconnect each taillight 3P connector and the high mount brake light 2P connector.
42. Measure the resistance between ACC unit 20P connector terminal No. 1 and body ground. There should be an open circuit or at least 1
MOhms.
Is the resistance as specified?
YES -
Go to step 43.
NO -
Repair a short to ground in the wire between the ACC unit and the brake light relay, or between the ACC unit and the brake lights circuits.?
43. Measure the resistance between ACC unit 20P connector terminal No. 1 and brake light relay 5P connector terminal No. 1. There should be
less than 1.0 Ohms.
Is the resistance as specified?
YES -
Check for loose or poor connections. If OK, update the ACC unit See: Cruise Control/Testing and Inspection/Programming and Relearning, then
recheck. If the ACC unit was already updated, replace the ACC unit See: Cruise Control/Cruise Control Module/Service and Repair.?
NO -
Repair an open in the wire between the ACC unit and the brake light relay.?
44. Check the brake pedal height, and adjust it if needed See: Brakes and Traction Control/Brake Pedal Assy/Adjustments.
