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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 505 (Automatic Transmission - 2ML70 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the S2 transmission manual shift switch.
  2. Ignition ON, verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Verify the scan tool Driver Shift Request parameter is Invalid.
    • If not the specified value, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K9 BCM.
  4. Install a 6.5-7.0 K Ω jumper wire between the signal circuit terminal 3 and the B+ circuit terminal 4. Verify the scan tool Driver Shift Request parameter is None.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K9 BCM.
  5. If all circuits test normal, test or replace the S2 transmission manual shift switch.
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