Check Fwd Switch
WARNING: This page is about a different variant/trim than selected.
DIAGNOSIS:
- LED does not come on even if FWD switch is ON.
- FWD signal circuit is open or shorted.
WIRING DIAGRAM:
RESISTANCE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK SPARE FUSE. | Is the spare fuse OK? | Go to step 2. | Replace the fuse. |
| 2 CHECK FWD SWITCH. Connect the Subaru Select Monitor to the data link connector. |
When the fuse is inserted to FWD switch, does the LED illuminate? | Go to step 3. | Go to step 4. |
| 3 CHECK COMBINATION METER. | Does the AWD warning light illuminate? | Go to INSPECTION FOR SPORT SHIFT SWITCH. < Ref. to CHECK SPORT SHIFT SWITCH , Diagnostic Procedure without Diagnostic Trouble Code (DTC). > | Go to step 9. |
4 CHECK HARNESS CONNECTOR BETWEEN TCM AND FWD SWITCH.
|
Is the resistance less than 1 Ω? | Go to step 5. | Repair the open circuit of harness between TCM and FWD switch connectors. |
| 5 CHECK HARNESS CONNECTOR BETWEEN FWD SWITCH AND CHASSIS GROUND. Measure the resistance of harness between FWD switch and chassis ground. Connector & terminal (F27) No. 19 - Chassis ground: |
Is the resistance less than 1 Ω? | Go to step 6. | Repair the open circuit of harness between FWD switch connector and chassis ground. |
| 6 CHECK HARNESS CONNECTOR BETWEEN TCM AND FWD SWITCH. Measure the resistance of harness connector between TCM and body to make sure that circuit does not short. Connector & terminal (B55) No. 17 - Chassis ground: |
Is the resistance more than 1 MΩ? | Go to step 7. | Repair the short circuit of harness between TCM and FWD switch connectors. |
7 CHECK INPUT SIGNAL FOR TCM.
|
Is the voltage less than 1 V? | Go to step 8. | Go to step 10. |
| 8 CHECK INPUT SIGNAL FOR TCM. Measure the signal voltage for TCM with the fuse removed from FWD switch connector. Connector & terminal (B55) No. 17 (+) - Chassis ground (-): |
Is the voltage more than 10.5 V? | Go to step 9. | Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > |
| 9 CHECK THE BODY INTEGRATED UNIT. Check DTC of body integrated unit. |
Is DTC of CAN communication displayed? | Perform the diagnosis according to DTC. | Go to step 10. |
| 10 CHECK COMBINATION METER. Check the AWD warning light. < Ref. to INSPECTION , Combination Meter System. > |
Is the AWD warning light OK? | Go to step 11. | Replace the combination meter assembly. < Ref. to COMBINATION METER . > |
| 11 CHECK POOR CONTACT. | Is there poor contact in FWD switch circuit? | Repair the poor contact. | Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > |