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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 214 (Automatic Transmission - ALLISON - Diagnosis) >> Diagnostic Tests >> DTC P0703: Brake Switch Circuit >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers listed below refer to step numbers in the diagnostic procedure:

  1. 3  - This step tests brake switch status.
  2. 4  - This step tests for voltage at the TCM connector C1.
  3. 5  - This step tests for voltage after the stoplamp switch.
  4. 6  - This step tests for voltage before the stoplamp switch.

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