Troubleshooting Diagnostic Procedure

U2005-68: (SAS) TROUBLESHOOTING DIAGNOSTIC PROCEDURE

Step	Inspection	Results	Action
1	PURPOSE: VERIFY ELECTRONICALLY CONTROLLED BRAKE UNIT/DSC HU/CM DTCs. Perform the DTC inspection for the electronically controlled brake unit/DSC HU/CM. (See DTC INSPECTION .) Is a DTC displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [DSC] .)
1		No	Go to the next step.
2	PURPOSE: INSPECT WIRING HARNESS (INCLUDING CONNECTOR/TERMINAL) BETWEEN ELECTRONICALLY CONTROLLED BRAKE UNIT/DSC HU/CM AND SAS CONTROL MODULE FOR MALFUNCTION WARNING: Handling the component parts improperly can accidentally operate (deploy) the air bag and the pre-tensioner seat belt, which may seriously injure you. Read the service warnings and cautions before handling the component parts of the SAS air bag system. (Refer to AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA/ISRAEL SPEC.] in service information.) (Refer to AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA/ISRAEL SPEC.] in service information.) Switch the ignition/main power OFF. Disconnect the negative battery terminal/negative lead-acid battery terminal and wait for 1 min or more. (Refer to NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION in service information.) Inspect the applicable circuit. (See CIRCUIT INSPECTION .) (See CONNECTOR INSPECTION .) Is the circuit normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform repair completion verification 1.
3	PURPOSE: INSPECT ELECTRONICALLY CONTROLLED BRAKE UNIT/DSC HU/CM FOR MALFUNCTION DEPENDING ON REPEATABILITY Install/connect the part removed/disconnected during the troubleshooting procedure. Connect the negative battery terminal/negative lead-acid battery terminal. (Refer to NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION in service information.) Switch the ignition ON (engine off or on)/switch the main power ON (READY off or on). Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the DTC inspection for the SAS control module. (See DTC INSPECTION .) Is the same DTC displayed?	Yes	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, replace the electronically controlled brake unit/DSC HU/CM and perform repair completion verification 1. (Refer to [ELECTRONICALLY CONTROLLED BRAKE UNIT REMOVAL/INSTALLATION] in service information.) (Refer to DSC HU/CM REMOVAL/INSTALLATION in service information.)
3		No	Perform repair completion verification 2.
Repair completion verification 1	PURPOSE: VERIFY IF VEHICLE IS REPAIRED Clear the DTC recorded in the memory. (See CLEARING DTC .) Perform the DTC inspection for the SAS control module. (See DTC INSPECTION .) Is the same DTC displayed?	Yes	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See MALFUNCTION DIAGNOSIS FLOW [CONTROLLER AREA NETWORK (CAN)] .) If the CAN communication is normal, perform the diagnosis from Step 1 again. If the malfunction is not resolved, replace the SAS control module, then go to the next step. (Refer to SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM - US/CANADA/ISRAEL SPEC.] in service information.)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs ARE DISPLAYED Perform the DTC inspection. (See DTC INSPECTION .) Are other DTCs displayed?	Yes	Repair or replace the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.