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Home >> Jeep >> 1998 >> Cherokee Classic, 2.5 P >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Vehicle Communications) >> Identifying Vehicle Communication Problems >> No Response Central Timer Module

No Response Central Timer Module

WARNING: This page is about a different car, the 1999 Dodge Pickup and 1999 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For connector terminal identification and wiring diagrams, see BODY CONTROL COMPUTER - INTRODUCTION article. Perform VERIFICATION TEST VER-1  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Remove and inspect fuse No. 11 from junction block. Junction block is on left side of instrument panel. If fuse is open, go to next step. If fuse is okay, go to step  3 .
  2. Using external ohmmeter, measure resistance between ground and fused ignition switch output run/start terminal (Dark Blue/White wire) on fuse No. 11 socket. If resistance is less than 5 ohms, repair short to ground in Dark Blue/White wire. Replace fuse No. 11. If resistance is 5 ohms or more, replace fuse No. 11.
  3. Install fuse No. 11. Remove and inspect fuse No. 6 from junction block. If fuse is open, next step. If fuse is okay, go to step  5 .
  4. Using external ohmmeter, measure resistance between ground and fused ignition switch output run/accy terminal (Dark Blue wire) on fuse No. 6 socket. If resistance is less than 5 ohms, repair short to ground in Dark Blue wire. Replace fuse No. 6. If resistance is 5 ohms or more, replace fuse No. 6.
  5. Install fuse No. 6. Disconnect Central Timer Module (CTM). CTM is located under left side of instrument panel. Using external ohmmeter, measure resistance between ground and CTM 18-pin connector terminal No. 3 (Black/Orange wire). If resistance is more than 5 ohms, repair open Black/Orange wire. If resistance is 5 ohms or less, go to next step.
  6. Measure resistance between ground and CTM 14-pin connector terminal No. 6 (Black/Light Green wire). If resistance is more than 5 ohms, repair open Black/Light Green wire. If resistance is 5 ohms or less, go to next step.
  7. Turn ignition on. Using scan tool, perform CCD Bus test. Connect jumper wire between ground and CTM 18-pin connector terminal No. 16 (Violet/Brown wire). If scan tool does not display BUS SHORT TO GROUND, repair open Violet/Brown wire. If scan tool displays BUS SHORT TO GROUND, go to next step.
  8. Disconnect jumper wire. Connect jumper wire between ground and CTM 18-pin connector terminal No. 17 (White/Black wire). If scan tool does not display BUS SHORT TO GROUND, repair open White/Black wire. If scan tool displays BUS SHORT TO GROUND, replace CTM.
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