Circuit Description
WARNING: This page is about a different car, the 2004 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
The Stability System Disable Indicator is controlled by the instrument cluster via class 2 serial data messages from the EBCM. When the instrument cluster sees a class 2 message from the EBCM that tells the IPC that the stability system is malfunctioning. The EBCM then disables VSES and TCS and sends a message to the instrument cluster to turn the Stability System Disable Indicator Always On and TCS indicators ON. Each time the ignition is cycled from OFF to ON, the VSES is enabled:
The following conditions will cause the VSES/TCS indicators to illuminate:
- The EBCM has disabled the VSES/TCS due to a DTC.
- The instrument cluster bulb check. When the ignition switch is turned to ON, the VSES/TCS indicators will turn on for approximately 3 seconds and then turn OFF.
Stability System Disable Indicator Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: ABS Schematics | |||
| 1 | Did you perform the ABS Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - ABS |
| 2 | Inspect the EBCM ground, making sure the ground is clear and torqued to the proper specification. Refer to Testing for Intermittent Conditions and Poor Connections
and Testing for Short to Ground
in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 3 |
| 3 | With a scan tool, observe the Warning Indicator parameter in the ABS/TCS/VSES data list. Does the scan tool display Off? |
Go to Step 4 | Go to Step 5 |
| 4 |
|
Go to Step 5 | Go to Step 6 |
| 5 | Inspect for poor connections at the harness connector of the EBCM. Refer to and in Wiring Systems. Did you find and correct the condition? |
Go to Step 9 | Go to Step 7 |
| 6 | Inspect for poor connections at the harness connector of the instrument cluster (IPC). 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 9 | Go to Step 8 |
| 7 | Replace the EBCM. Refer to Did you complete the repair? |
Go to Step 9 | - |
| 8 | Replace the instrument cluster (IPC). Refer to Instrument Panel Cluster (IPC) Replacement
in Instrument Panel, Gages and Console. Did you complete the replacement? |
Go to Step 9 | - |
| 9 | Operate the system in order to verify the repair. Did you complete the repair? |
System OK | Go to Step 2 |