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Home >> Pontiac >> 2008 >> Solstice GXP, Automatic >> Repair and Diagnosis >> Electrical >> Motors, Switches, Relays >> Wiring Systems And Power Management - DTC B1370 To DTC B1441 & DTC P2535 >> DTC B1370 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
  1. Inspect for an open Ign Switch fuse. The fuse should be OK.
    • If the fuse is open, test the following circuits for a short to ground, if all circuits test OK, replace the BCM.
      • Battery positive voltage of the ignition switch
      • Accessory voltage
      • Off/Run/Crank voltage
      • Run/Crank voltage
      • Accessory wakeup serial data (BCM output)
      • Run/crank ignition 1 voltage (BCM output)
  2. Disconnect the harness connector at the ignition switch.
  3. Verify that a test lamp illuminates between the B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance.
    4. IMPORTANT: The ignition switch component test must be preformed before proceeding with this test to verify the integrity of the switch.
  4. Perform the ignition switch component test. The test should pass.
    • If the ignition switch fails, replace the ignition switch.
  5. Ignition OFF, disconnect the X4 and X2 harness connector at the BCM, test for less than 1.0 volt between the following circuit terminals of the BCM and ground.
    • Off/Run/Crank voltage terminal 56
    • 5 volt reference terminal 62
    • Accessory voltage terminal C8
    • Run/Crank voltage terminal D3
    • If greater than specified, test the circuit for a short to voltage.
  6. Test for less than 1.0 ohm between the BCM and the ignition switch on the following circuit terminals.
    • 5 volt reference, BCM terminal 62 and ignition switch terminal 6
    • Off/Run/Crank voltage, BCM terminal 56 and ignition switch terminal 5
    • Accessory voltage, BCM terminal C8 and ignition switch terminal 4
    • Run/Crank voltage, BCM terminal D3 and ignition switch terminal 3
    • If greater than specified, test the circuit for open/high resistance
  7. Test for infinite resistance between the ignition key resistor signal circuit terminal 4 of the BCM and ground.
    • If less than specified, test the signal circuit for a short to ground.
  8. If all circuits test normal, replace the BCM.
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