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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 249 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2771) >> DTC P0719 or P0724 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Install a scan tool. Turn ON the ignition, leaving the engine OFF. Observe the Brake Switch parameter. The parameter should display RELEASED.
    • If the scan tool displays APPLIED, disconnect the stop lamp switch connector.
  2. Observe the Brake Switch parameter on the scan tool with the stop lamp switch connector disconnected. The parameter should display APPLIED.
    • If the scan tool displays RELEASED after the stop lamp switch connector disconnected, test the stop lamp switch.
    • If the scan tool displays APPLIED after the stop lamp switch connector is disconnected, test the stop lamp switch signal circuit for a short to voltage.
  3. While observing the brake switch parameter on the scan tool, use the J 35616  GM-approved terminal test kit and install a fused jumper wire between the ignition 1 voltage circuit and the stop lamp switch signal circuit. The brake switch parameter should change from RELEASED to APPLIED when the fused jumper wire is installed.
    • If the brake switch parameter changes, replace the stop lamp switch.
  4. Inspect the STOP LPS fuse; refer to Circuit Protection - Fuses . The fuse should not be blown.
    • If the fuse is blown, test the ignition 1 voltage circuit and the stop lamp switch signal circuit for a short to ground.
  5. Using a DMM, measure the voltage between the ignition 1 voltage circuit and ground at the stop lamp switch connector. The voltage should be near 12-volts.
    • If the voltage is not near the specified voltage, test the ignition voltage circuit for an open or high resistance.
  6. Using the J 35616  measure the resistance of the stop lamp switch signal circuit between the BCM and the stop lamp switch. The resistance should be less than 10 ohms.
    • If the resistance is greater than 10 ohms, test the stop lamp switch signal circuit for an open or high resistance.
    • If all circuits and connections test normal, replace the BCM.
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