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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 73 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0719: Brake Switch Circuit - Low Input >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra and 2002 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. 4

    This step tests for stoplamp switch voltage to the PCM connector.

  2. 7

    This step isolates the stoplamp switch as a source for setting the DTC.

  3. 10

    This step tests for a short to ground in the ignition voltage circuit (441) to the stoplamp switch.

  4. 12

    This step tests for a short to ground in the brake switch signal circuit (420), from the stoplamp switch to the PCM.

  5. 13

    This step isolates the PCM as a source for causing the fuse to open.

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