Normal Operation
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is applied, the stoplamp switch routes voltage to the smart junction box (SJB) through circuit 511 (LG). Voltage is also routed to the PCM through circuit 599 (PK/LG). The SJB then provides voltage to the stoplamp through circuits 1783 (RD/WH), 1374 (TN/LB), 1728 (LB/OG), and 1363 (WH/RD). Ground for the stoplamp is provided through circuit 1205 (BK).
| DTC Description | Fault Trigger Conditions |
|---|---|
| B1485 - Brake Pedal Input Short to Battery | An on-demand DTC that sets when the SJB detects a short to voltage from the stoplamp switch input. |
| B2049 - Left Rear Turn Lamp Circuit Open | A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the LH rear lamp 1 voltage supply circuit. |
| B2051 - Right Rear Turn Lamp Circuit Open | A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the RH rear lamp 1 voltage supply circuit. |
| B2519 - High Mount Stop Lamp Circuit Failure | A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the high mounted stoplamp voltage supply circuit. |
| B2528 - Left Rear Stop Lamp Circuit Short to Battery | A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the LH rear lamp 1 or lamp 2 voltage supply circuit. |
| B2529 - Left Rear Turn Lamp Circuit Failure | A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the LH rear lamp 1 voltage supply circuit. |
| B2534 - Right Rear Stop Lamp Circuit Short to Battery | A continuous and on-demand DTC that sets when the SJB detects a short to voltage from the RH rear lamp 1 or lamp 2 voltage supply circuit. |
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Stoplamp switch
- SJB
- PCM