DTC B2550
When the body control module (BCM) receives a signal requesting to illuminate the backup lamps, battery voltage is sent directly from the BCM through the backup lamp supply voltage circuit to the backup lamps.
Voltage for the backup lamp supply voltage circuit as well as the courtesy lamp supply voltage circuit is from the left instrument panel fuse block TBC 2B 15-amp fuse directly through the BCM to these circuits.
Brake lights or do you mean tail lights ?
Stop Lamps Always On
Did you perform the Diagnostic System Check - Vehicle?
YES - Go to Step 2
NO - Go to Diagnostic System Check - Vehicle
2
Depress the brake pedal.
Does the system operate normally?
YES - Go to Testing for Electrical Intermittents
No - Go to Step 3
3
Disconnect the stop lamp switch.
Do the brake lamps go out?
YES - Go to Step 6
No - Go to Step 4
4
Remove the CHMSL fuse.
Do the brake lamps go out?
Yes - Go to Step 7
NO - Go to Step 5
5
Remove the STOP fuse.
Do the brake lamps go out?
YES - Go to Step 8
NO - Go to Step 9
6
Inspect for poor connections at the harness connector of the switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs.
Did you find and correct the condition?
YES - Go to Step 11
NO - Go to Step 10
7
Repair the short to voltage in the CHMSL supply voltage circuit. Refer to Wiring Repairs.
Did you complete the repair?
YES - Go to Step 11
--
8
Repair the short to voltage in the stop lamp switch signal circuit. Refer to Wiring Repairs.
Did you complete the repair?
Go to Step 11
--
9
Repair the short to voltage in the stop lamp supply voltage circuit. Refer to Wiring Repairs.
Did you complete the repair?
Go to Step 11
--
10
Replace the stop lamp switch. Refer to Stop Lamp Switch Replacement.
Did you complete the replacement?
Go to Step 11
--
11
Operate the system in order to verify the repair.
Did you correct the condition?
System OK
Go to Step 3
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