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DTC C0324: Transfer Case Lock Circuit High: Testing

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
  1. If ATC system check was performed, go to next step. If system check was not performed, see ATC SYSTEM CHECK  .
  2. Turn ignition off. Connect scan tool to DLC. Turn ignition to run position (engine off). Using scan tool, record all freeze frame and failure records. Turn ignition off. Disconnect ATC control module connector C1. Disconnect transfer case connectors. Turn ignition to run position (engine off). Connect test light between ground and Tan wire terminal "D" at transfer case connector. See WIRING DIAGRAM  . If test light is on, go to step 5). If test light is off, go to next step.
  3. Using a DVOM, measure resistance between Orange and Tan wire terminals of transfer case connector (brake control solenoid). If resistance is 20-80 ohms, go to step 6). If resistance is not 20-80 ohms, go to next step.
  4. Replace transfer case brake control solenoid. When replacement is complete, go to step 7).
  5. Locate and repair short to voltage in Tan wire circuit between ATC control module and transfer case connectors. When repair is complete, go to step 7).
  6. Replace ATC control module. See REMOVAL & INSTALLATION  . When replacement is complete, go to next step.
  7. Turn ignition off. Reconnect all disconnected components. Set parking brake. Start and run engine at idle. Shift transmission to "N" position. Shift transfer case between all modes, allowing time between each mode shift for transfer case to complete shift request. Using scan tool, select "Specific DTC" and enter DTC C0324. If test runs and passes, system is functioning properly. If test does not run and pass, repeat test from step 1).
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