DTC U1901 [DSC/RSC]

id0402b3811700

DTC

U1901

SAS control module system (CAN2 line malfunction)

DETECTION CONDITION

•  The signal from the SAS control module is not within specification.

POSSIBLE CAUSE

•  SAS control module malfunction

•  Open or short circuit in the CAN2_L wiring harness between SAS control module terminal 2D and DSC/RSC HU/CM terminal M

•  Open or short circuit in the CAN2_H wiring harness between SAS control module terminal 2H and DSC/RSC HU/CM terminal P

•  DSC/RSC HU/CM malfunction

•  Poor connection at connectors (female terminal)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT SAS CONTROL MODULE MALFUNCTION • Turn the ignition switch off. • Using the M-MDS, perform the DTC inspection for the SAS control module. (See DTC DISPLAY.) • Are any DTCs detected?	Yes	Go to applicable DTC inspection. (See DTC TABLE.)
1		No	Go to the next step.
2	INSPECT SAS CONTROL MODULE SIGNAL (CAN2 LINE) FOR OPEN CIRCUIT • Disconnect the DSC/RSC HU/CM connectors. • Disconnect the SAS control module connectors. • Inspect for continuity between the DSC/RSC HU/CM connectors (vehicle harness-side) and the following SAS control module connector terminals (vehicle harness-side): ― SAS control module (CAN2_L): 2D—M ― SAS control module (CAN2_H): 2H—P • Is there continuity?	Yes	Go to the next step.
2		No	Repair or replace the wiring harness, then go to Step 4.
3	INSPECT SAS control module SIGNAL (CAN2 LINE) FOR SHORT CIRCUIT • Inspect for continuity between the following DSC/RSC HU/CM connector terminals (vehicle harness-side) and body ground: ― DSC/RSC HU/CM (CAN2_L): M ― DSC/RSC HU/CM (CAN2_H): P • Is there continuity?	Yes	Repair or replace the wiring harness, then go to Step 4.
3		No	Go to the next step.
4	VERIFY THAT THE SAME DTC IS NOT PRESENT • Clear the DTCs from the memory. (See ON-BOARD DIAGNOSIS [DSC/RSC].) • Are the same DTCs present?	Yes	Repeat the inspection from Step 1. If the malfunction recurs, replace the DSC/RSC HU/CM, then go to the next step. (See DSC/RSC HU/CM REMOVAL/INSTALLATION [L.H.D.].) (See DSC/RSC HU/CM REMOVAL/INSTALLATION [R.H.D.].)
4		No	Go to the next step.
5	VERIFY THAT NO OTHER DTCS ARE PRESENT • Are any other DTCs output?	Yes	Go to the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DSC/RSC].)
5		No	DTC troubleshooting completed.

DTC	U1901		SAS control module system (CAN2 line malfunction)
DETECTION CONDITION		• The signal from the SAS control module is not within specification.
POSSIBLE CAUSE		• SAS control module malfunction • Open or short circuit in the CAN2_L wiring harness between SAS control module terminal 2D and DSC/RSC HU/CM terminal M • Open or short circuit in the CAN2_H wiring harness between SAS control module terminal 2H and DSC/RSC HU/CM terminal P • DSC/RSC HU/CM malfunction • Poor connection at connectors (female terminal)