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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 323 (Adjustable Pedal System) >> Diagnostic Information and Procedures >> DTC B3604 or B3605 >> Circuit/System Testing

Circuit/System Testing

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  1. Disconnect the harness connector at the adjustable pedal switch.
  2. Ignition ON, test for B+ between the appropriate B+ reference circuit listed below and ground:
    • X88/Z88 - terminal 11
    • Z75 - terminal 5
    • If greater than the specified range, test the B+ reference circuit for a short to voltage. If the circuit tests normal, replace the MSM.
    • If less than the specified range, test the B+ reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  3. Verify the scan tool Pedal Forward Switch parameter is Inactive.
    • If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the MSM.
    • X88/Z88 - terminal 12
    • Z75 - terminal 6
  4. Verify the scan tool Pedal Aft Switch parameter is Inactive.
    • If not the specified value, test the appropriate signal circuit terminal listed below for a short to voltage. If the circuit tests normal, replace the MSM.
    • X88/Z88 - terminal 10
    • Z75 - terminal 4
  5. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Forward Switch parameter should be Active.
    • X88/Z88 - terminal 12
    • Z75 - terminal 6
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  6. Install a 3 A fused jumper wire between the appropriate signal circuit terminal listed below and B+. The scan tool Pedal Aft Switch parameter should be Active.
    • X88/Z88 - terminal 10
    • Z75 - terminal 4
    • If not the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  7. If all circuits test normal, test or replace the adjustable pedal switch.
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