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DTC PZ1972, Low Power Control Fault: Testing

  1. Turn ignition switch to OFF position. Disconnect PZM connector. Using DVOM, measure resistance between PZM connector terminal B11 and ground. If resistance is greater than 5 ohms, replace PZM. If resistance is 5 ohms or less, go to next step.
  2. Remove 10-amp PZM fuse located in trunk compartment fuse block. Using DVOM, measure resistance between PZM connector terminal B11 and ground. If resistance is 5 ohms or less, repair short to ground in low power control output circuit between 10-amp PZM fuse and PZM. If resistance is greater than 5 ohms, go to next step.
  3. Install 10-amp PZM fuse. Remove 20-amp CLUSTER fuse, 10-amp RADIO/PHONE fuse and 30-amp AMP fuse, all located in trunk compartment fuse block. Using DVOM, measure resistance between PZM connector terminal B11 and ground. If resistance is 5 ohms or less, repair short to ground in controlled power relay circuit between 20-amp CLUSTER fuse, 10-amp RADIO/PHONE fuse, 30-amp AMP fuse and controlled power relay. If resistance is greater than 5 ohms, go to next step.
  4. Install 10-amp RADIO/PHONE fuse. Using DVOM, measure resistance between PZM connector terminal B11 and ground. If resistance is 5 ohms or less, repair short to ground in fuse circuit between 10-amp RADIO/PHONE fuse and accessory time delay cut-off relay. If resistance is greater than 5 ohms, go to next step.
  5. Install 20-amp CLUSTER fuse. Using DVOM, measure resistance between PZM connector terminal B11 and ground. If resistance is 5 ohms or less, repair short to ground in fuse circuit between 20-amp CLUSTER fuse and instrument panel cluster. If resistance is greater than 5 ohms, repair short to ground in fuse circuit between 30-amp AMP fuse and audio relay or amplifier.
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