Circuit Description
The class 2 serial data line from the EBTCM controls the TRACTION OFF indicator. When the EBTCM sees the traction control line go low through the momentary traction control switch, the EBTCM disables the TCS and sends a message to the IPC to turn the TRACTION OFF indicator on. Each time the ignition switch is cycled from the OFF to the RUN position, the TCS is enabled until the traction control switch is pressed.
Diagnostic Aids
| • | Thoroughly inspect the wiring and the connectors. Failure to carefully and fully inspect the wiring and the connectors may result in misdiagnosis. Misdiagnosis may cause part replacement without repairing the malfunction. |
| • | Inspect all related connectors for corrosion or damage. Repair as necessary. |
| • | If an intermittent malfunction exists, refer to Testing for Electrical Intermittents in Wiring Systems. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step checks for a short to ground in the traction control switch or CKT.
-
This step checks if the IPC has the ability to control the indicator.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the ABS Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 |
Does the switch status change from pressed to released as the TCS switch is pressed and released? | -- | ||
3 |
Is the resistance within specifications? | OL | ||
4 | Repair the short to ground in CKT 1571, being sure to check the traction control switch for a short. Refer to Wiring Repairs in Wiring Systems. Is the circuit repair complete? | -- | Refer to Diagnostic System Check | -- |
5 |
Did the indicator turn off? | -- | ||
6 | Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | -- |
7 | Suspect the IPC. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console. Is the diagnosis complete? | -- | Go to Diagnostic System Check | -- |
