Diagnostic Aids

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

Faulty emergency brake switches
Low brakes fluid level or faulty brake fluid switch
DTC C0054, C0055, C0065, or C0067 fault conditions exist. Refer to Diagnostic Trouble Code (DTC) List in Antilock Brake System.
DDPR is disabled due to the following fault conditions in DBC/7ABS system:
- Two wheel speed sensors inoperative on same axle
- Battery 2 motor input open or short to ground
- Motor ground open or short to battery
- ECU ground open or short to battery
- Ignition open or short to ground
Grounded circuit between the cluster and the EBCM
Faulty cluster/lamp driver module
Faulty EBCM

Brake Warning Indicator Always On

Step	Action	Value(s)	Yes	No
1	Did you review the brake warning system circuit description and perform the necessary inspections?	-	Go to Step 2	Go to Symptoms - Hydraulic Brakes
2	Observe ABS warning lamp. Is the ABS warning lamp ON also?	-	Go to Step 4	Go to Step 3
3	Possibility of general brake system failure. Repair the brake system. Did you find and correct the condition?	-	System OK	-
4	Connect the scan tool and retrieve ABS DTCs. Does the scan tool display any ABS DTCs?	-	Refer to Diagnostic Trouble Code (DTC) List in Antilock Brakes	Go to Step 5
5	Turn the Ignition switch OFF. Disconnect the EBCM harness from the EBCM. Turn the Ignition switch ON. Connect a fused jumper sire between terminal 18 of the EBCM harness and body ground. Did the brake warning lamp turn OFF?	-	Go to Step 6	Go to Step 7
6	Replace the EBCM. Did you complete the replacement?	-	System OK	-
7	Turn the Ignition switch OFF. Remove the cluster assembly from the I/P. Disconnect the white cluster harness connector from the cluster assembly. Disconnect the LDM harness connector from the LDM. Connect an ohmmeter to the cluster harness B8 and then to body ground. Was the resistance within the specified value?	OL (open circuit)	Go to Step 9	Go to Step 8
8	Find and repair the short to ground between the cluster harness and the LDM harness. Did you find and correct the condition?	-	System OK	-
9	Turn the Ignition switch OFF. The LDM harness and EBCM harness are still disconnected. Connect an ohmmeter to terminal F of the LDM harness and then to the EBCM harness terminal 18. Was the resistance measured less than the specific value?	2 Ω	Go to Step 11	Go to Step 10
10	Repair the open or high resistance between the LDM and the EBCM. Did you find and correct the condition?	-	System OK	-
11	Replace the LDM Did you complete the replacement?	-	System OK	Go to Step 12
12	Replace the cluster assembly. Did you complete the replacement	-	System OK	-