Test A: No Communication With Front Electronic Module (Fem)
- Turn ignition switch to LOCK position. Disconnect Front Electronic Module (FEM) harness connectors C201c and C201f. Turn ignition switch to RUN position. Measure voltage between FEM 12-pin harness connector C201c terminal No. 6 (Orange/Green wire) and ground. See Fig 1 . Measure voltage between FEM 20-pin harness connector C201f terminal No. 1 (Orange/Yellow wire) and ground. See Fig 2 . If voltages are greater than 10 volts, go to next step. If any voltage is less than 10 volts, repair open in appropriate wire and retest system operation.
- Turn ignition switch to LOCK position. Disconnect FEM 17-pin harness connector C201a. Measure resistance between ground and Black/Red wires at FEM 17-pin harness connector C201a terminals No. 11, 13, 14 and 15. See Fig 3 . Measure resistance between FEM 12-pin harness connector C201c terminal No. 12 (Black/Red wire) and ground. If resistance are less than 5 ohms, repair module communications concern. See MODULE COMMUNICATIONS NETWORK - LS article. If any resistance is greater than 5 ohms, repair appropriate Black/Red wire and retest system operation.
Fig 1: Identifying Front Electronic Module (FEM) Harness Connector C201c & Driver's Door Module (DDM) Harness Connector C501a Terminals