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DTC B2719: UTD - Trunk Tamper Switch Fault: Testing

WARNING: This page is about a different car, the 1998 Cadillac Eldorado and 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch to OFF position. Disconnect PZM connectors. Using DVOM, measure resistance between PZM Brown 24-pin connector C1, terminal A7 (Light Blue wire) and ground. If resistance is 5 ohms or less, go to next step. If resistance is greater than 5 ohms, replace PZM. See REMOVAL & INSTALLATION.
  2. Disconnect trunk tamper switch Black 3-pin connector. Using DVOM, measure resistance between trunk tamper switch connector terminal "A" (Light Blue wire) and ground. If resistance is greater than 5 ohms, replace trunk tamper switch. If resistance is 5 ohms or less, repair short to ground in Light Blue wire between trunk tamper switch and PZM.