Pinpoint Test J: Abs Module Communication Concern With SASM

Normal Operation and Fault Conditions

The SASM is also known as the SCCM.

With the ignition ON, the SCCM sends messages to the GWM over the HS-CAN2, The GWM relays these messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a SCCM failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the SCCM, REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
ABS U0212:87	Lost Communication With Steering Column Control Module: Missing Message	This DTC sets when the ABS module does not receive any messages from the SCCM within the allowed time.
ABS U0428:86	Invalid Data Received From Steering Angle Sensor Module: Signal Invalid	Sets when the messages from the SCCM contain invalid or faulty information.

Possible Causes

Network communication concern
GWM
SCCM

J1 CHECK THE COMMUNICATION NETWORK

Ignition ON.

Press the Read Vehicle Information button to view the results of the modules communicating on the network.

Press Read Vehicle Information button to retrieve DTCs from the vehicle.
NOTE: DTCs may be displayed from previous diagnostic actions. Only available in the on-line service information

Does the SASM pass the Network Test?

Yes	RETRIEVE and RECORD all SCCM DTCs. REFER to: Steering Wheel and Column Electrical Components . If there are no DTCs in the SCCM, GO to J2

No	DIAGNOSE the SCCM does not communicate with the diagnostic scan tool. REFER to: Controller Area Network (CAN) Module Communications Network .

J2 CHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) DTCS

Using a diagnostic scan tool, Carry out the ABS module self-test.

Using a diagnostic scan tool, Clear the ABS module Diagnostic Trouble Codes (DTCs).

Ignition OFF.

Ignition ON.

Test drive the vehicle at speeds above 20 km/h (12 mph) and make at least one left and one right turn.

Using a diagnostic scan tool, Carry out the ABS module self-test.

Are any of the Diagnostic Trouble Codes (DTCs) listed in the Fault Setting Conditions Table retrieved again?

Yes

GO to J3

No	The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition

J3 CHECK FOR DTC (DIAGNOSTIC TROUBLE CODE) U3003:16 AND U3003:17
- Review the recorded DTCs from the ABS module self-test.
Is DTC U3003:16 or U3003:17 present?

Yes For DTC U3003:16: GO to Pinpoint Test A For DTC U3003:17: GO to Pinpoint Test F

No GO to J4

J4 RETRIEVE THE DTCS FROM THE SCCM (STEERING COLUMN CONTROL MODULE) SELF-TEST

Using a diagnostic scan tool, carry out the SCCM self-test.

Are any DTCs present?

Yes	DIAGNOSE the SCCM does not communicate with the diagnostic scan tool. REFER to: Controller Area Network (CAN) Module Communications Network .

GO to J5

J5 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERN

NOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.

Check the vehicle service history for recent service actions related to the SCCM or ABS module. If recent service history is found:
- Verify the correct replacement module was installed. HVBOM may be used to verify correct part fitment.
- Verify the configuration of replacement module was correct. Re-configure the module using as-built data if prior configuration is suspect.
- Verify the module was not obtained from a like vehicle and installed into customer vehicle. Return the swapped module to source vehicle and obtain new replacement module.

Operate the system and determine if the observable symptom is still present.

Is the observable symptom still present?

Yes

GO to J6

No	The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration.

J6 CHECK FOR COMMUNICATION DTCS IN OTHER MODULES
- Ignition ON.
- NOTE: Diagnostic Trouble Codes (DTCs) may be displayed from previous diagnostic actions.
  
  Press Read Vehicle Information button to retrieve DTCs from the vehicle. only available in the on-line service information
Is DTC U0126:xx or U0428:xx set in 1 or more modules in addition to the ABS module?

Yes GO to J7

No GO to J8

J7 VERIFY SCCM (STEERING COLUMN CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect SCCM connector C226A.

Disconnect SCCM connector C226B.

Disconnect ABS Module connector C135.

Using a good light source, inspect all disconnected electrical connectors for the following:
- Corrosion - install new connector or terminal and clean the module pins
- Damaged or bent pins - install new terminals or pins
- Pushed-out pins - install new pins as necessary
- Spread terminals - install new terminals as necessary

Connect ABS Module connector C135. Make sure the connector seats and latches correctly.

Connect SCCM connector C226A. Make sure the connector seats and latches correctly. Make sure the connector seats and latches correctly.

Connect SCCM connector C226B. Make sure the connector seats and latches correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new SCCM. REFER to: Steering Column Control Module (SCCM) .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.

J8 VERIFY ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION

Ignition OFF.

Disconnect SCCM connector C226A.

Disconnect SCCM connector C226B.

Disconnect ABS Module connector C135.

Using a good light source, inspect all disconnected electrical connectors for the following:
- Corrosion - install new connector or terminal and clean the module pins
- Damaged or bent pins - install new terminals or pins
- Pushed-out pins - install new pins as necessary
- Spread terminals - install new terminals as necessary

Connect ABS module connector C135. Make sure the connector seats and latches correctly.

Connect SCCM connector C226A. Make sure the connector seats and latches correctly. Make sure the connector seats and latches correctly.

Connect SCCM connector C226B. Make sure the connector seats and latches correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes

CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. INSTALL a new EBB unit. REFER to: Electric Brake Booster (EBB) - Full Hybrid Electric Vehicle (FHEV)/Plug-In Hybrid Electric Vehicle (PHEV) . If no service articles address this concern, INSTALL a new EBB unit. REFER to: Electric Brake Booster (EBB) . REFER to: Electric Brake Booster (EBB) .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. ADDRESS the root cause of any connector or pin issues.