Check Fwd Switch
WARNING: This page is about a different variant/trim than selected.
DIAGNOSIS:
- The LED does not come on even if FWD switch is ON.
- The FWD switch circuit is open or short.
WIRING DIAGRAM:
DIAGNOSTIC PROCEDURE CHART
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FWD SWITCH. Connect Select Monitor to data link connector, and display the LED monitor. |
When the fuse is inserted to FWD switch, does LED light up? | Go to step CHECK BRAKE SWITCH.< Ref. to CHECK BRAKE SWITCH , Diagnostic Procedure without Diagnostic Trouble Code (DTC). > | Go to step 2. |
2 CHECK AWD WARNING LIGHT.
|
Is the AWD warning light bulb OK? | Go to step 3. | Check the AWD warning light bulb. < Ref. to COMBINATION METER ASSEMBLY . > |
3 CHECK HARNESS CONNECTOR BETWEEN TCM AND FWD SWITCH.
|
Is the resistance less than 1 Ω? | Go to step 4. | Repair the open circuit in harness between TCM and FWD switch connector. |
| 4 CHECK HARNESS CONNECTOR BETWEEN FWD SWITCH AND CHASSIS GROUND. Measure the resistance of harness between FWD switch and chassis ground. Connector & terminal (F27) No. 35 - Chassis ground: |
Is the resistance less than 1 Ω? | Go to step 5. | Repair the open circuit in harness between FWD switch connector and chassis ground. |
| 5 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. 14 - Chassis ground: |
Is the resistance more than 1 MΩ? | Go to step 6. | Repair the short circuit in harness between TCM and FWD switch connector. |
6 CHECK INPUT SIGNAL FOR TCM.
|
Is the voltage less than 1 V? | Go to step 7. | Go to step 11. |
| 7 CHECK INPUT SIGNAL FOR TCM. Measure the signal voltage for TCM while removing the fuse from FWD switch connector. Connector & terminal (B55) No. 14 (+) - Chassis ground (-): |
Is the voltage 6 - 9.1 V? | Go to step 8. | Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > |
8 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER.
|
Is the resistance less than 1 Ω? | Go to step 9. | Repair the open circuit in harness between TCM and combination meter and poor contact in connector. |
| 9 CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER. Measure the resistance of harness connector between TCM and chassis ground to make sure that circuit does not short. Connector & terminal (B54) No. 12 - Chassis ground: |
Is the resistance more than 1 MΩ? | Go to step 10. | Repair the short circuit in harness between TCM and combination meter connector. |
10 CHECK OUTPUT SIGNAL EMITTED FROM TCM.
|
Is the voltage less than 1 V? | Go to step 11. | Go to step 12. |
| 11 CHECK OUTPUT SIGNAL EMITTED FROM TCM. Measure the signal voltage for TCM while removing the fuse from FWD switch connector. Connector & terminal (B54) No. 12 (+) - Chassis ground (-): |
Is the voltage more than 9 V? | Go to step 12. | Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > |
| 12 CHECK POOR CONTACT. | Is there poor contact in FWD switch circuit? | Repair the poor contact. | Replace the TCM. < Ref. to TRANSMISSION CONTROL MODULE (TCM) . > |