No Communication with Electronic Brake Control Module/Electronic Brake and Traction Control Module. Cadillac Seville 1998

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 Brakes 🢒 Antilock Brake System 🢒 No Communication with Electronic Brake Control Module/Electronic Brake and Traction Control Module

ABS Components
Cell 44: PWR, GND, BPMV Pump Motor and Solenoids
Handling ESD Sensitive Parts Notice
Cell 10: Battery - Underhood Fuse(Junction) Block
Cell 10: IGN 3 Relay and HVAC, ABS Fuses
Cell 50: Class Serial Data Line (2 of 2)

Circuit Description

The class 2 serial data line allows all of the modules on the line to transmit information to each other as needed. Each module is assigned an ID. All of the information sent out on the line is assigned a priority by which it is received. When the ignition is turned ON, each module begins to send and receive information. Each module on the class 2 serial data line knows what information the module needs to send out and what information the module should be receiving. What the modules do not know is which module is supposed to send the information. This information is only learned after the module has received the information needed along with the ID of the module that sent the information. This information is then remembered until the ignition switch is turned off.

Diagnostic Aids

•	It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

•	An intermittent malfunction can be caused by poor connections, broken insulation, or a wire that is broken inside the insulation.

•	If an intermittent malfunction exists, refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Step	Action	Value(s)	Yes	No
1	Did you perform the Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check
2	Turn OFF the ignition. Connect a scan tool to the data link connector (DLC). Turn ON the ignition, with the engine OFF. Attempt to establish communication with other module on the serial data class 2, such as the PCM. Does the scan tool communicate with any other modules on the serial data class 2?	--	Go to Step 3	Go to Data Link Communications System Check in Wiring Systems
3	Check the rear junction block ABS Fuse. Is the fuse good?	--	Go to Step 4	Go to Step 9
4	Check the underhood junction block ABS SOL Fuse. Is the fuse good?	--	Go to Step 12	Go to Step 5
5	Install a new ABS SOL Fuse in the underhood junction block. Recheck the fuse. Is the fuse good?	--	Go to Diagnostic System Check	Go to Step 6
6	Turn OFF the ignition. Remove the ABS SOL fuse. Disconnect the EBTCM harness connector. Connect the J 39700 universal pinout box using the J 39700-25 cable adapter to the EBTCM harness connector only. Using a J 39200 DMM, measure the resistance between the J 39700 terminals D and B. Is the resistance within the specified range?	OL (infinite)	Go to Step 7	Go to Step 8
7	Replace the EBTCM. Refer to Electronic Brake Control Module Replacement . Did you complete the repair?	--	Go to Diagnostic System Check	--
8	Repair the short to ground in CKT 442. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Diagnostic System Check	--
9	Install a new ABS Fuse. Turn OFF the ignition. Turn ON the ignition, with the engine OFF. Recheck the fuse. Is the fuse good?	--	Go to Diagnostic System Check	Go to Step 10
10	Turn OFF the ignition. Remove the ABS Fuse. Disconnect the EBTCM harness connector. Connect the J 39700 universal pinout box using the J 39700-25 cable adapter to the EBTCM harness connector only. Using a J 39200 DMM, measure the resistance between the J 39700 terminals A and B. Is the resistance within the specified range?	OL (infinite)	Go to Step 7	Go to Step 11
11	Repair the short to ground in CKT 241. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Diagnostic System Check	--
12	Install the fuses, if removed. Turn ON the ignition, with the engine OFF. Using a J 39200 DMM, measure the voltage at the ABS Fuse by probing between the fuse test terminals and a good ground. Is the voltage within the specified range?	Battery Voltage	Go to Step 13	Go to Step 20
13	Using a J 39200 DMM, measure the voltage at the ABS SOL Fuse by probing between the fuse test terminals and a good ground. Is the voltage within the specified range?	Battery Voltage	Go to Step 14	Go to Step 21
14	Turn OFF the ignition. Disconnect the EBTCM harness connector. Connect the J 39700 universal pinout box using the J 39700-25 cable adapter to the EBTCM harness connector only. Using a J 39200 DMM, measure the resistance between the J 39700 terminal B and a good ground. Is the resistance less than the specified value?	2 ohms	Go to Step 16	Go to Step 15
15	Repair the open in CKT 1150 or G102. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Diagnostic System Check	--
16	Turn ON the ignition, with the engine OFF. Using a J 39200 DMM, measure the voltage between the J 39700 terminals A and B. Is the voltage within the specified range?	Battery Voltage	Go to Step 18	Go to Step 17
17	Repair the open in CKT 241. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Diagnostic System Check	--
18	Using a J 39200 DMM, measure the voltage between the J 39700 terminals D and B. Is the voltage within the specified range?	Battery Voltage	Go to Step 7	Go to Step 19
19	Repair the open in CKT 442. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair?	--	Go to Diagnostic System Check	--
20	Replace the rear junction block. Refer to Rear Seat Cushion Replacement in Seats. Did you complete the repair?	--	Go to Diagnostic System Check	--
21	Replace the underhood junction block. Refer to Underhood Fuse Block Replacement in Engine Electrical. Did you complete the repair?	--	Go to Diagnostic System Check	--