U0126-LOST COMMUNICATION WITH STEERING ANGLE SENSOR (SAS)

For a complete wiring diagram Refer to Section 8W.

When Monitored:
With the ignition on.

Battery voltage between 10 and 16 volts.

IOD fuse installed.

TIPM is configured correctly.
Set Condition:
Bus messages not received from the SCM (Steering Angle Sensor or SAS) for approximately 2 to 5 seconds.

Possible Causes

(D65) CAN C BUS(+) CIRCUIT SHORTED TO VOLTAGE

(D64) CAN C BUS(-) CIRCUIT SHORTED TO GROUND

TIPM NOT CONFIGURED CORRECTLY

STEERING ANGLE SENSOR

STEERING ANGLE SENSOR POWER AND GROUND

MODULE THAT SET THIS DTC

Diagnostic Test

1. VERIFY DTC IS ACTIVE

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding.

With the scan tool, read active DTCs.

Is this DTC active?

Yes

Go To 2

Refer to the Stored Lost Communication test procedure. Refer to the table of contents in this section.
Perform BODY VERIFICATION TEST – VER 1.

2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCS

With the scan tool, read all active DTCs from all modules.

NOTE: Check for TIPM configuration, CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs.

Does the scan tool display any active DTCs to the conditions listed above?

Yes

Diagnose and repair the DTC. Refer to the Table of Contents for a complete list of the symptoms.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)

Go To 3

3. VERIFY THAT THE SCM (SAS) IS ACTIVE ON THE BUS

Turn the ignition on.
With the scan tool, select Network Diagnostics.
Verify that the SCM (SAS) is active on the bus.

Is the SCM (SAS) active on the bus?

Yes

Go To 4

Refer to the No Response test procedure. Refer to the table of contents in this section.

4. CHECK FOR ADDITIONAL COMMUNICATION RELATED DTCS

With the scan tool, select Network Diagnostics.

Is there more than one module with active DTCs “Logged Against” the SCM (SAS)?

Yes

Replace/update the SCM (Steering Angle Sensor or SAS) in accordance with the service information.
Perform the appropriate VERIFICATION TEST.

Go To 5

5. CLEAR DTC IN MODULE SETTING FAULT

With the scan tool, select the module setting the DTC against the SCM (SAS).
Clear active DTCs.

Is this DTC still active?

Yes

Replace/update the module that set this DTC in accordance with the service information.
Perform the appropriate VERIFICATION TEST.

Go To 6

6. CYCLE IGNITION

Cycle the ignition from RUN to OFF three times ending with the key in the RUN position.

Does this DTC become active?

Yes

Go To 7

The condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
Perform the appropriate VERIFICATION TEST.

7. CHECK FOR ADDITIONAL LOST COMMUNICATION FAULTS

With the scan tool, select Network Diagnostics.

Does the TIPM and other CAN C BUS modules show Lost Communication with the remaining CAN C BUS modules?

Yes

Go To 8

Replace/update the module that set this DTC in accordance with the service information.
Perform the appropriate VERIFICATION TEST.

8. (D65) CAN C BUS (+) CIRCUIT SHORTED TO VOLTAGE

Measure the voltage between the (D65) CAN C Bus (+) circuit and ground.

Is the voltage above 5 volts?

Yes

Repair the (D65) CAN C Bus (+) circuit for a short to voltage.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Go To 9

9. (D64) CAN C BUS (-) CIRCUIT SHORTED TO GROUND

Turn the ignition off.
Measure the resistance between ground and the (D64) CAN C Bus (-) circuit.

Is the resistance below 10K Ohms?

Yes

Repair the (D64) CAN C Bus (-) circuit for a short to ground.

Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).

Replace/update the module that set this DTC in accordance with the service information.
Perform the appropriate VERIFICATION TEST.