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Home >> Suzuki >> 2009 >> XL7 Limited, AWD >> Repair and Diagnosis >> Transmission >> Automatic Transmission >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Switch Circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the transmission shift lever.
  2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.
    • If the test lamp does not illuminate, test the IGN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  3. Verify the scan tool Driver Shift Request parameter indicates Invalid.
    • If other than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. Ignition OFF, test for 300-600 ohms between the signal circuit terminal B and ground.
    • If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the transmission control.
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