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DTC PZ1971, Inadvertent Power Fault: Testing

  1. Turn ignition switch to OFF position. Connect scan tool and select BCM TEST. Select INADV. POWER. Turn inadvertent power on. Turn interior lights on. If interior lights illuminate, go to step 4). If interior lights do not illuminate, go to next step.
  2. Disconnect PZM connector. Remove inadvertent power relay. Using DVOM, measure voltage between inadvertent power relay connector terminal C2 and ground. If voltage is greater than one volt, repair short to battery in inadvertent power circuit between inadvertent power relay and PZM. If voltage is one volt or less, go to next step.
  3. Using DVOM, measure resistance between inadvertent power relay connector terminal A1 and 10-amp MIRROR fuse located in engine compartment fuse/relay block. If resistance is greater than 5 ohms, repair open in fuse circuit between inadvertent power relay and 10-amp MIRROR fuse. If resistance is 5 ohms or less, replace PZM.
  4. Disconnect PZM connector. Remove inadvertent power relay. Using DVOM, measure resistance between inadvertent power relay connector terminal C2 and ground. If resistance is 5 ohms or less, repair short to ground in inadvertent power circuit between inadvertent power relay and PZM. If resistance is greater than 5 ohms, replace PZM.
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