Diagnostic Aids

Typical causes of the ABS warning lamp ON with no DTCs set:

Grounded circuit between the cluster and the EBCM
Faulty cluster/lamp driver module
Faulty EBCM

ABS Indicator Always On

Step	Action	Value(s)	Yes	No
1	Did you perform a Diagnostic System Check - ABS?	-	Go to Step 2	Go to Diagnostic System Check - ABS
2	Turn the ignition switch OFF. Disconnect the electronic brake control module (EBCM) harness from the EBCM. Turn ON the ignition, with the engine OFF. Connect a fused jumper wire between terminal 23 of the EBCM harness and body ground. Did the amber ABS lamp turn OFF?	-	Go to Step 3	Go to Step 4
3	Replace the EBCM. Refer to Brake Modulator Assembly Replacement . Did you complete the replacement?	-	System OK	-
4	Turn the ignition switch OFF. Remove the cluster assembly from the instrument panel (I/P). Disconnect the white cluster harness connector from the cluster assembly. Disconnect the lamp driver module (LDM) harness connector from the LDM. Connect an ohmmeter to cluster harness terminal 4 and then to body ground. Was the resistance within the specific value?	OL (open circuit)	Go to Step 6	Go to Step 5
5	Find and repair the short to ground between the cluster harness and the LDM harness. Did you find and complete the repair?	-	System OK	-
6	Turn the ignition switch OFF. Disconnect the EBCM harness from the EBCM. Disconnect the LDM harness from the LDM. Connect an ohmmeter to terminal D of the LDM harness and then to EBCM harness terminal 16. Was the resistance measured less than the specific value?	2 Ω	Go to Step 8	Go to Step 7
7	Repair the open or high resistance between the LDM and the EBCM. Did you find and correct the condition?	-	System OK	-
8	Replace the LDM. Did you complete the replacement?	-	System OK	-
9	Replace the cluster assembly. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement?	-	System OK	-