Diagnosis Procedure

1. Turn the ignition switch OFF.
2. Disconnect RAS control unit harness connector.
3. Check the voltage between RAS control unit harness connector terminal and ground.
   VOLTAGE SPECIFICATION
   
   

   RAS control unit		-	Voltage (Approx.)
   Connector	Terminal
   B37	27	Ground	0 V

4. Turn the ignition switch ON.
   CAUTION: Never start the engine.
5. Check the voltage between RAS control unit harness connector terminal and ground.

Is the inspection result normal? 

YES: GO TO 2.

NG: Check the following items. Repair or replace the malfunctioning parts.

• 10A fuse (#45) open
  • Short among 10A fuse (#45) connector, RAS control unit harness connector No. 27 terminal and the ground
• Open between the ignition switch and RAS control unit harness connector No. 27 terminal
• Ignition switch

Check the continuity between RAS control unit harness connector and ground.

Is the inspection result normal? 

YES: GO TO 3.

NG: Repair or replace the harnesses and connectors.

With CONSULT-III 

1. Connect RAS control unit harness connector.
2. Turn the ignition switch from OFF to ON.
3. Perform RAS control unit self-diagnosis.

Without CONSULT-III 

1. Connect RAS control unit harness connector.
2. Start the engine.
3. Perform the self-diagnosis. Refer to "DIAGNOSIS DESCRIPTION ".

Is DTC "C1909" or "RAS warning lamp flickering pattern:11" detected? 

YES: Replace RAS control unit. Refer to "EXPLODED VIEW ".

NO: GO TO 4.

With CONSULT-III 

Check the "DATA MONITOR" value of each DTC detected with the self-diagnosis function. Refer to "REFERENCE VALUE ".

Is each data the standard value? 

YES: Check each harness connector pin terminal for disconnection.

NO: Replace RAS control unit. Refer to "EXPLODED VIEW ".