Test B: No Communications With Rear Electronic Module
NOTE:
Cycle ignition switch from LOCK to RUN position to enable the switched system power feature.
- Turn ignition switch to LOCK position. Disconnect Rear Electronic Module (REM) 26-pin harness connectors C420c. Disconnect REM 20-pin harness connector C420D. REM is located in right side of trunk compartment, above battery. Turn ignition switch to RUN position. Measure voltage between ground and REM harness connector C420d terminal No. 3 (Orange/Black wire). See Fig 1 . Measure voltage between ground and REM harness connector C420c terminal No. 13 (Orange/Black wire). If battery voltage exists at both terminals, go to next step. If battery voltage does not exist at either terminals, repair power distribution circuit as necessary. See POWER DISTRIBUTION article in WIRING DIAGRAMS.
- Turn ignition switch to LOCK position. Disconnect remaining REM harness connectors. Measure resistance between ground and REM harness connector C420b terminal No. 12 (Black/Orange wire). Measure resistance between ground and REM harness connector C420c terminals No. 11, 12, 25 and 26 (all Black/Orange wires). Measure resistance between ground and REM harness connector C420d terminal No. 2 (Black/Orange wire). Measure resistance between ground and REM harness connector C420f terminal No. 3 (Black/Orange wire). Measure resistance between ground and REM harness connector C420g terminal No. 1 (Black/Orange wire). If all resistances are less than 5 ohms, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - LS article. If any resistance is 5 ohms or more, repair open in appropriate wire between REM and ground. See GROUND DISTRIBUTION article in WIRING DIAGRAMS.