DTC P0504: Brake Pedal Position Switch Circuit Malfunction Turn the ignition switch ON (II). Check BRAKE PEDAL POSITION SWITCH B in the DATA LIST with the HDS when the brake pedal pressed. Is ON indicated?
YES | - | Go to Step 3 .
NO | - | Check the brake pedal position switch, then go to Step 29 .
Check BRAKE PEDAL POSITION SWITCH A in the DATA LIST with the HDS when the brake pedal pressed. Is ON indicated?
YES | - | Go to Step 4 .
NO | - | Go to Step 7 .
Release the brake pedal. Check BRAKE PEDAL POSITION SWITCH B in the DATA LIST with the HDS. Is OFF indicated?
YES | - | Go to Step 6 .
NO | - | Go to Step 20 .
Check BRAKE PEDAL POSITION SWITCH A in the DATA LIST with the HDS. Is OFF indicated?
YES | - | Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the brake pedal position switch and at the ECM.■
NO | - | Check the brake pedal position switch, then go to Step 29 .
Check the brake lights. Do the brake lights come on?
YES | - | Go to Step 8 .
NO | - | Go to Step 12 .
Turn the ignition switch OFF, and wait 30 seconds. Disconnect the brake pedal position switch 4P connector. Disconnect ECM connector No. 2 (58P). Check for continuity between ECM connector No. 2 terminal No. 38 and brake pedal position switch 4P connector terminal No. 2. Is there continuity?
YES | - | Go to Step 34 .
NO | - | Repair open in the wire between the brake pedal position switch and ECM connector No. 2 terminal No. 38, then go to Step 30 .
Turn the ignition switch OFF. Disconnect the brake pedal position switch 4P connector. |