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 - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
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 16 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 I/P. Disconnect the 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 A2 and then to body ground. Is the resistance as specified?	OL (open circuit)	Go to Step 6	Go to Step 5
5	Find and repair the short to ground between the I/P harness and the LDM harness. Did you find and correct the condition?	-	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 5 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 Cluster Replacement . Did you complete the replacement?	-	System OK	-