Diagnostic Aids

Typical causes of the ABS warning lamp inoperative with no DTCs set.

Faulty ABS bulb/loose socket
I/P fuse open
Faulty cluster/lamp driver module
Faulty EBCM
Grounded circuit between the EBCM and the cluster

ABS Indicator Inoperative (Delphi)

Step	Action	Value(s)	Yes	No
1	Did you perform a Diagnostic System Check?	-	Go to Step 2	Go to Diagnostic System Check - ABS
2	Disconnect the EBCM. Turn ON the ignition, with the engine OFF. Did the amber ABS lamp turn ON?	B+	Go to Step 3	Go to Step 4
3	Replace the EBCM. Refer to Brake Modulator Assembly Replacement (Delphi) or Brake Modulator Assembly Replacement (Mando) . Did you completer the replacement?	-	System OK	-
4	Check the cluster fuse. Is the fuse and terminal contact OK?	-	Go to Step 6	Go to Step 5
5	Replace the open fuse and/or repair the loose terminals. Find the short, which caused the fuse to open, if applicable. Did you find and correct the condition?	-	System OK	-
6	Remove the amber ABS bulb from the cluster. Inspect for an open bulb filament or poor socket contact. Was the socket and the bulb OK?	-	Go to Step 8	Go to Step 7
7	Replace the bulb/socket as needed. Did you complete the replacement?	-	System OK	-
8	Turn the Ignition switch OFF. The EBCM harness is still disconnected. Remove the cluster assembly from the instrument panel. Disconnect the white cluster harness connector from the cluster assembly. Turn ON the ignition, with the engine OFF. Connect a voltmeter to terminal 11 of the white cluster harness and then to body ground. Was the voltage within the specified value?	B+	Go to Step 10	Go to Step 9
9	Find and repair the source of low voltage on the cluster voltage supply terminal. Did you find and correct the condition?	-	System OK	-
10	Turn the Ignition switch OFF. Disconnect the white cluster harness connector from the cluster assembly. Connect an ohmmeter between the white cluster harness terminal 4 and lamp driver module (LDM) harness terminal E. Was the resistance measured less than the specified value?	2 Ω	Go to Step 12	Go to Step 11
11	Repair the open or high resistance between the cluster and the LDM. Did you find and correct the condition?	-	System OK	-
12	Turn the Ignition switch OFF. The LDM harness and the EBCM harness are still disconnected. Connect an ohmmeter to the EBCM harness terminal 23 and then to body ground. Was the resistance within the specified value?	OL (open circuit)	Go to Step 14	Go to Step 13
13	Find the repair to the short to ground between the cluster harness and the EBCM harness. Did you find and correct the condition?	-	System OK	-
14	Replace the LDM. Did you complete the replacement?	-	System OK	Go to Step 15
15	Replace the cluster assembly. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement?	-	System OK	-