Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool

Communications Network

Pinpoint Test B: The ABS Module Does Not Respond To The Scan Tool

Normal Operation

The ABS module communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- ABS module

PINPOINT TEST B : THE ABS MODULE DOES NOT RESPOND TO THE SCAN TOOL

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Failure to disconnect the battery when instructed results in false resistance readings.

B1 CHECK THE ABS MODULE VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: ABS Module C135.

- Ignition ON.

- Measure the voltage between the ABS module C135-25, circuit SBB36 (GN/RD), harness side and ground; and between the ABS module C135-35, circuit CBB54 (VT/OG), harness side and ground.






Is the voltage greater than 10 volts?

Yes
GO to B2.
No
VERIFY the Battery Junction Box (BJB) fuse 36 (30A) or 54 (5A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the Wiring Diagrams to identify the possible causes of the circuit short [1][2]Diagrams By Number. CLEAR the DTCs. REPEAT the network test with the scan tool.

B2 CHECK THE ABS MODULE GROUND CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the ABS module C135-38, circuit GD121 (BK/YE), harness side and ground.






Is the resistance less than 5 ohms?

Yes
GO to B3.
No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

B3 CHECK THE HS-CAN (High Speed Controller Area Network) CIRCUITS BETWEEN THE DLC (Data Link Connector) AND THE ABS MODULE FOR AN OPEN

- Measure the resistance between the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side and the ABS module C135-26, circuit VDB04 (WH/BU), harness side.






- Measure the resistance between the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side and the ABS module C135-14, circuit VDB05 (WH), harness side.






Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to B4.
No
REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

B4 CHECK FOR CORRECT ABS MODULE OPERATION

- Disconnect the ABS module connector.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect the ABS module connector and make sure it seats correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new ABS module. CLEAR the DTCs. REPEAT the network test with the scan tool.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.