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 the event), notifying the driver that ABS is in operation.
Diagnostic Aids
The following conditions may cause a malfunction:
| • | A poor connection |
| • | Rubbed-through wire insulation |
| • | A broken wire inside the insulation |
| • | Open IG COIL fuse |
| • | Open bulb filament |
| • | Open within I/P gage printed circuit |
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 |
Do not start the engine. Did the amber ABS Active Indicator turn ON? | -- | ||
3 | Remove and inspect the IG COIL fuse. Is the IG COIL fuse open? | -- | ||
4 | Inspect the BLK/WHT wire between the Junction Block and the Instrument Panel Cluster (IPC) for damage that may cause a short to ground. Is there any damage present? | -- | ||
5 |
Is the voltage within the specified range? | Battery Voltage | Go to Power Distribution Schematics in Wiring Systems | |
6 |
Did the ABS Active Indicator lamp turn ON? | -- | ||
7 |
Is the voltage within the specified range? | Battery Voltage | ||
8 | Use the J 39200 in order to measure the resistance between the IPC connector C1 terminal 10 and the EBCM connector C1 terminal A6. Is the resistance within the specified range? | 0-2 ohms | ||
9 | Remove and inspect the ABS Active Indicator bulb. Refer to Instrument Cluster Bulb Replacement in Instrument Panel, Gauges and Console. Is the ABS Active Indicator bulb open? | -- | ||
10 |
Is the repair complete? | -- | -- | |
11 | Replace the IG COIL fuse. Is the repair complete? | -- | -- | |
12 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | -- | |
13 | Repair the open or high resistance in the BLK/WHT wire between the Junction Block and the IPC. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
14 | Repair the open or high resistance in the BLU/YEL wire between the IPC and the EBCM. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |
15 | Replace the ABS Active Indicator bulb. Refer to Instrument Cluster Bulb Replacement in Instrument Panel, Gauges and Console. Is the repair complete? | -- | -- | |
16 | The malfunction is intermittent or not present at this time. Refer to Diagnostic Aids for more information. Is the action complete? | -- | System OK | -- |
