Circuit Description
The ABS ACTIVE indicator lamp is connected to the IG COIL fuse. This circuit is hot in ON and START ignition switch positions. The Electronic Brake Control Module (EBCM) turns ON the ABS ACTIVE by grounding the ABS active indicator control circuit.
When the ignition switch is turned to the ON position, the EBCM turns ON the ABS ACTIVE indicator for 3 seconds for a bulb check. Whenever the vehicle is involved in an ABS event, the EBCM tuns ON the ABS ACTIVE indicator for the duration of the event (and 1-2 seconds after an ABS event), notifying the driver that ABS is in operation.
Diagnostic Aids
The following list contains items that need to be inspected when diagnosing this system:
| • | Short to ground between EBCM and the ABS ACTIVE indicator lamp |
| • | EBCM connector C1 |
| • | C200 |
| • | I/P cluster C1 |
Use the Lamp Test function of the Scan Tool in order to turn the indicator on while looking for an intermittent malfunction in the ABS warning indicator circuitry.
Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:
| • | Backed out terminals |
| • | Improper mating |
| • | Broken locks |
| • | Improperly formed or damaged terminals |
| • | Poor terminal-to-wiring connections |
| • | Physical damage to the wiring harness |
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
Important: Zero the J 39200 test leads before making any resistance measurements. Refer to the J 39200 user's manual. | ||||||||||
1 | Was the ABS Diagnostic System Check performed? | -- | ||||||||
2 |
Did the ABS Active Indicator lamp turn OFF? | -- | ||||||||
3 | Inspect the EBCM connector and the terminals for the following conditions:
Is there evidence of damage, poor terminal contact or terminal corrosion? | -- | ||||||||
4 |
Is the resistance within the specified range? | OL (Infinite) | Go to Instrument Cluster System Check in Instrument Panel, Gauges and Console | |||||||
5 | Replace all of the terminals that exhibit signs of damage, poor terminal contact or terminal corrosion. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |||||||
6 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- | |||||||
7 | Repair the short to ground in the BLU/YEL wire between the IPC and the EBCM. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |||||||
