1. Measure voltage between brake pedal position switch 4P connector terminal No. 1 and body ground.

Is there battery voltage?

YES | - | Go to Step 16 .
NO | - | Go to Step 15 .

1. Check No. 13 HORN, STOP (20 A) fuse in the under-hood fuse/relay box.

Is the fuse OK?

YES | - | Repair open in the wire between the brake pedal position switch and No. 13 HORN, STOP (20 A) fuse, then go to Step 30 .
NO | - | Repair short in the wire between the brake pedal position switch and No. 13 HORN, STOP (20 A). Also replace No. 13 HORN, STOP (20 A), then go to Step 30 .

1. Turn the ignition switch OFF, and wait 30 seconds.

1. Disconnect ECM connector No. 2 (58P).

1. Check for continuity between ECM connector No. 2 terminal No. 38 and body ground.

Is there continuity?

YES | - | Repair short in the wire between the brake pedal position switch and ECM connector No. 2 terminal No. 38, then go to Step 30 .
NO | - | Go to Step 19 .

1. Check the brake pedal position switch.

Is the brake pedal position switch OK?

YES | - | Go to Step 34 .
NO | - | Adjust or replace the brake pedal position switch, then go to Step 30 .

1. Turn the ignition switch OFF.

1. Disconnect the brake pedal position switch 4P connector.

1. Turn the ignition switch ON (II).