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BUS +/- Signals Open Or No Response From Central Timer Module

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Connect scan tool to Data Link Connector (DLC), under lower left side of instrument panel. Turn ignition on. Using scan tool, attempt to communicate with Air Bag Control Module (ACM) and Controller Anti-lock Brake (CAB) module. If scan tool is able to identify or communicate with ACM and CAB, go to next step. If scan tool is not able to identify or communicate with ACM and/or CAB, perform appropriate DTC or symptom test. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  and SYMPTOM IDENTIFICATION  tables under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition off. Disconnect Gray 26-pin Central Timer Module (CTM) connector C1. CTM is located behind left side kick panel. Ensure interior lights are off. Using DVOM, measure resistance between ground and Gray 26-pin CTM connector C1 terminals No. 1 and 16 (Black/Light Green wires) and No. 2 (Black wire). See Figure . If resistance is 10 ohms or less on each ground circuit, go to next step. If resistance is more than 10 ohms on any ground circuit, check for an open between appropriate CTM connector terminal and ground. See GROUND DISTRIBUTION article in WIRING DIAGRAMS. Repair as necessary.
  3. Disconnect Gray 12-pin CTM connector C3. Using test light connected to ground, probe Gray 12-pin CTM connector C3 terminals No. 1 (Red/Tan wire) and No. 6 (Red/Light Green wire). See Figure . If test light illuminates on both circuits, go to next step. If test light does not illuminate on both circuits, check for open in appropriate circuit between power distribution center and CTM. See POWER DISTRIBUTION article in WIRING DIAGRAMS. Repair as necessary.
  4. Turn ignition on. Using scan tool, ensure there is PCI BUS communication with other modules (besides the ACM and CAB). If scan tool is able to identify or communicate with all modules, go to next step. If scan tool is not able to identify or communicate with all modules, refer to appropriate communications symptom for diagnosis. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table under SELF-DIAGNOSTIC SYSTEM.
  5. Connect Scope Input Cable (CH7058) to channel one connector on scan tool. Connect Cable-To-Probe Adapter (CH7062) and Black and Red test probes to scope input cable. Connect Black test probe to ground. Connect Red test probe to PCI BUS circuit at Gray 26-pin CTM connector C1 terminal No. 10 (Violet/Yellow wire).
  6. Using scan tool, select PEP MODULE TOOLS, LAB SCOPE, LIVE DATA. Select 12 VOLT SQUARE WAVE. Press F2 for SCOPE. Press F2 and use DOWN arrow to set voltage scale to 20 volts. Press F2 again when complete. Turn ignition on. If reading on lab scope toggles between zero and 7.5 volts, go to next step. If reading on lab scope does not toggle between zero and 7.5 volts, repair open in PCI BUS circuit (Violet/Yellow wire).
  7. Replace CTM. See CENTRAL TIMER MODULE  under REMOVAL & INSTALLATION.
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