• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Stop Lamp Supply Voltage | B3445 00 | 1 | 2 | -- |
|
When the brake pedal is applied, the brake pedal switch normally closed contact signal circuit voltage is interrupted to the body control module (BCM). The BCM then applies a voltage to the stop lamp supply voltage circuit to the stop lamps.
• | The ignition is ON. |
• | The stop lamps must be commanded ON. |
The BCM detects a short to ground in the stop lamp supply voltage circuit when the stop lamps are commanded ON.
The stop lamps do not illuminate.
• | The conditions for setting the DTC are no longer present. |
• | A history DTC clears after 100 malfunction-free ignition cycles. |
• | The BCM receives the clear code command from the scan tool. |
Lighting Systems Connector End Views
Ignition ON, press the brake pedal. The stop lamps should illuminate.
⇒ | If a short between terminals is found, replace the stop lamp socket or circuit board as applicable. |
⇒ | If all circuits/connections test normal, replace the BCM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |