Table B ABS Warning Indicator Inoperative

CIRCUIT DESCRIPTION
The Electronic Brake Control Module (EBCM) controls the operation of the amber ABS indicator lamp by means of a lamp driver relay. The amber ABS indicator lamp is connected to the IG-COIL METER fuse through CKT 8B01. This circuit is hot in ON and START ignition switch positions.

When The Lamp Driver Relay Is In The OFF State - (CKT 9U01 is open), the lamp driver relay grounds the amber ABS indicator lamp through CKT 6B01. This causes to turn ON the amber ABS indicator lamp.

When The EBCM Commands OFF The ABS indicator - the EBCM turns ON the lamp driver relay by grounding CKT 9U01. This causes the lamp driver relay to open the path to ground in CKT 6B01, turning OFF the amber ABS indicator lamp.

When The Ignition Switch Is Turned To The ON Position - the EBCM turns ON the ABS indicator for 3 seconds for a bulb check. Whenever a malfunction is detected within the ABS system, the EBCM tuns ON the ABS indicator, notifying the driver that ABS needs to be serviced. If the EBCM commands the red BRAKE warning indicator ON due to an ABS malfunction that may degrade base braking operation and cannot do so, the ABS indicator will flash to indicate the serious nature of the problem.

DIAGNOSTIC AIDS
The following list contains items that need to be inspected when diagnosing this system:
^ Open IG-COIL METER fuse.
^ Open bulb filament.
^ Open or poor G200.
^ Short to ground in lamp driver relay control circuit (CKT 9U01).
^ Open within I/P gage printed circuit.
^ Faulty lamp driver relay (open contacts).
^ Faulty EBCM.

Inspect The Following Harness Connectors - for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness before component replacement:
^ Lamp driver relay.
^ EBCM connector C1.
^ I/P cluster C3.

Table B: ABS Warning Indicator Inoperative (Part 1 Of 3):

Table B: ABS Warning Indicator Inoperative (Part 2 Of 3):

Table B: ABS Warning Indicator Inoperative:

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
[4] Checks the amber ABS indicator lamp circuit and bulb.
[6] Checks the amber ABS indicator lamp circuit.
[7] Checks for power to the I/P gage cluster.
[8] Checks ground circuit.
[9] Checks for a short to ground in the lamp driver relay control circuit causing the relay to stay ON even though the EBCM is commanding it OFF.
[10] Checks for continuity at the lamp driver relay in the OFF state.
[20] Checks EBCM operation of the ABS indicator through Tech 2 scan tool commands.