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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Battery, Charging System And Starting System) >> Diagnostic Information and Procedures >> DTC B1424 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the TDM harness connector.
  2. Measure and record the voltage at the battery terminals. Ignition in ON position, measure the voltage between the Accessory Voltage circuit and the ground circuit of the TDM. Verify that the voltage readings do not differ more than 1 volt.
    • If greater than 1 volt, test the Accessory Voltage circuit and the ground circuit of the TDM for an open/high resistance. If the circuits test normal, replace the TDM.
  3. Go to Charging System Test 
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