Traction Off Indicator Always On Escalade
Circuit Description
The EBCM turns OFF the traction off indicator by applying ground to the service traction control signal circuit. When the inverting driver module detects the service traction control signal circuit is open, the inverting driver module applies ground to the traction off indicator control circuit in order to illuminate the traction off indicator.
Diagnostic Aids
The traction control system can be controlled by the operator in the following ways:
| • | Through operation of the traction control switch. |
| • | Through programming of the traction control system automatic engagement feature. |
Depending on the programmed state, the operation of the traction control system, as well as the operation of the traction off and low traction indicators, differs. For a more detailed explanation of these operational characteristics, refer to Traction Control Indicator Lamps in ABS Description and Operation .
Observe the data list parameters listed below in order to determine the status of the traction control system when it is unknown if the system is operational.
| • | Traction Control Enabled |
| • | Traction Off Lamp Command |
Press the traction control switch and observe the scan tool in order to verify a change in the status of the data list parameters.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent Conditions and Poor Connections , Wiring Repairs and Connector Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests if the EBCM is commanding the inverting driver module to turn OFF the traction off indicator.
-
This step tests if the inverting driver module is receiving adequate power and ground in order to power up.
-
This step tests if the inverting driver module is falsely illuminating the traction off indicator.
-
This step tests the service traction control signal circuit for a short to ground by substituting the IPC with a test lamp.
-
This step simulates pressing and releasing a properly functioning traction control switch.
-
The traction control switch may be damaged if the traction control switch signal circuit is shorted to voltage.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics | |||
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | |
2 |
Does the traction off indicator illuminate for 3 seconds and then turn OFF? | Go to Diagnostic Aids | Go to Step 3 |
3 | Press and release the traction control switch. Does the traction off indicator turn OFF? | Go to Diagnostic Aids | Go to Step 4 |
4 |
Does the Traction Control Enabled status change? | Go to Step 5 | Go to Step 11 |
5 |
Does the scan tool display Traction Off Lamp Command - On? | Go to Step 19 | Go to Step 6 |
Does the test lamp illuminate? | Go to Step 7 | Go to Step 12 | |
Backprobe the inverting driver module harness connector in order to connect a test lamp between the battery positive voltage circuit and the ground circuit of the inverting driver module. Refer to Probing Electrical Connectors in Wiring Systems. Does the test lamp illuminate? | Go to Step 9 | Go to Step 8 | |
8 | Repair the open in the battery positive voltage circuit or the ground circuit of the inverting driver module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | -- |
Does the traction off indicator turn OFF? | Go to Step 20 | Go to Step 10 | |
Does the test lamp illuminate? | Go to Step 22 | Go to Step 17 | |
|
Important: Do not disconnect the traction control switch harness connector during this step.
Does the Traction Control Enabled status change? | Go to Step 13 | Go to Step 14 | |
12 | Test the service traction control signal circuit for an open between the EBCM and the inverting driver module. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 23 | Go to Step 18 |
13 | Test the ground circuit of the traction control switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 23 | Go to Step 15 |
Test the traction control switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 23 | Go to Step 19 | |
15 | Inspect for poor connections at the harness connector of the traction control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 23 | Go to Step 16 |
16 | Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement . Did you complete the replacement? | Go to Step 23 | -- |
17 | Replace the IPC. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 23 | -- |
18 | Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 23 | Go to Step 19 |
19 |
Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | Go to Step 23 | -- |
20 | Inspect for poor connections at the harness connector of the inverting driver module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 23 | Go to Step 21 |
21 | Replace the inverting driver module. Did you complete the replacement? | Go to Step 23 | -- |
22 | Repair the short to ground in the traction off indicator control circuit. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | Go to Step 23 | -- |
23 |
Does the traction off indicator turn ON and OFF each time the switch is pressed? | System OK | Go to Step 2 |
Traction Off Indicator Always On Exc. Escalade
Circuit Description
The ignition 1 voltage circuit supplies 12 volts to the traction control switch. The EBCM turns OFF the traction off indicator by applying ground to the service traction control signal circuit.
Diagnostic Aids
The traction control system can be controlled by the operator in the following ways:
| • | Through operation of the traction control switch. |
| • | Through programming of the traction control system automatic engagement feature. |
Depending on the programmed state, the operation of the traction control system, as well as the operation of the traction off and low traction indicators, differs. For a more detailed explanation of these operational characteristics, refer to Traction Control Indicator Lamps in ABS Description and Operation .
Observe the data list parameters listed below in order to determine the status of the traction control system when it is unknown if the system is operational.
| • | Traction Control Enabled |
| • | Traction Off Lamp Command |
Press the traction control switch and observe the scan tool in order to verify a change in the status of the data list parameters.
Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to Testing for Intermittent Conditions and Poor Connections , Wiring Repairs and Connector Repairs in Wiring Systems.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step simulates pressing and releasing a properly functioning traction control switch.
-
The traction control switch may be damaged if the traction control switch signal circuit is shorted to voltage.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Antilock Brake System Schematics Connector End View Reference: Antilock Brake System Connector End Views | |||
1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | |
2 |
Does the traction off indicator illuminate for 3 seconds and then turn OFF? | Go to Diagnostic Aids | Go to Step 3 |
3 | Press and release the traction control switch. Does the traction off indicator turn OFF? | Go to Diagnostic Aids | Go to Step 4 |
4 |
Does the Traction Control Enabled status change? | Go to Step 5 | Go to Step 7 |
5 |
Does the scan tool display Traction Off Lamp Command - On? | Go to Step 13 | Go to Step 6 |
6 |
Important: Do not disconnect the traction control switch harness connector during this step. Ensure the ignition is turned ON for the duration of this step.
Does the test lamp illuminate? | Go to Step 9 | Go to Step 8 |
|
Important: Do not disconnect the traction control switch harness connector during this step.
Does the Traction Control Enabled status change? | Go to Step 11 | Go to Step 10 | |
8 | Test the service traction control signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 12 |
9 | Inspect for poor connections at the harness connector of the traction control switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 11 |
Test the traction control switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13 | |
11 | Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement . Did you complete the replacement? | Go to Step 14 | -- |
12 | Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13 |
13 |
Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure. Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Did you complete the replacement? | Go to Step 14 | -- |
14 | Press and release the traction control switch several times. Does the traction off indicator turn ON and OFF each time the switch is pressed? | System OK | Go to Step 2 |
