Symptom Tests
NOTE:
When no trouble codes can be retrieved, but ABS related symptoms exist, use ABS symptom chart to determine diagnostic procedure.
ABS Symptom Chart
| Condition | Possible Source | Action |
|---|---|---|
| No communication with the anti-lock brake control module |
CJB Fuse 10 (15A). Battery junction box (BJB) Fuse 15 (50A). Anti-lock brake control module. Circuit. |
GO to Pinpoint Test A. |
| Unable to enter self-test | Anti-lock brake control module. |
GO to Pinpoint Test B. |
| Spongy brake pedal with no warning indicator |
Air in brake hydraulic system. | GO to Pinpoint Test H. |
| Poor vehicle tracking during anti-lock function |
Air in brake hydraulic system. Hydraulic control unit (HCU). Base brake system. |
GO to Pinpoint Test I. |
| The traction control is inoperative |
Anti-lock brake control module. Hydraulic control unit (HCU). Base brake system. Thermal model (will reset after brakes cool down) |
GO to Pinpoint Test J. |
| The yellow ABS warning indicator does not self-check |
Circuit. Instrument cluster. Anti-lock brake control module. |
GO to Pinpoint Test K. |
| The yellow ABS warning indicator and traction control active indicator always on |
Circuit. Instrument cluster. Anti-lock brake control module. |
GO to Pinpoint Test L. |
| The traction control cannot be disabled |
Circuit. Traction control switch. Anti-lock brake control module. |
GO to Pinpoint Test M. |