Smart Access System (Keyless Start) (Diagnostic Codes & Symptom Tests): Diagnosis Lexus IS II facelift

INSPECTION PROCEDURE

HINT

Before performing the inspection, depress the brake pedal and check that the stop lights come on. If the stop lights do not come on when the brake pedal is depressed, refer to the information shown in the brackets. Refer to PROBLEM SYMPTOMS TABLE .

Scheme 149

Scheme 150

1. CHECK DTC OUTPUT (MULTIPLEX NETWORK COMMUNICATION SYSTEM) Delete the DTC. Refer to «DTC CHECK / CLEAR»(ref-387396-S31508654092011022400000) . Check for the multiplex network communication system DTCs B1210, B1214 and B1215. HINT: If the DTCs for the multiplex network communication system malfunction are output, inspect those DTCs first. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-387386-S38489328662011022400000) . OK No DTC is output. NG --> GO TO MULTIPLEX COMMUNICATION SYSTEM OK: Go to next step
2. CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM) Delete the DTC. Refer to «DTC CHECK / CLEAR»(ref-387396-S31508654092011022400000) . Check for the CAN communication system DTC U0146. HINT: If the DTCs for the CAN communication system malfunction are output, inspect those DTCs first. Refer to «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-387391-S01390035312011022400000) . OK No DTC is output. NG --> GO TO CAN COMMUNICATION SYSTEM OK: Go to next step
3. INSPECT FUSE (STOP SW) Remove the STOP SW fuse from the cowl side J/B RH. Measure the resistance of the fuse. Standard resistance Below 1 ohms NG --> REPLACE FUSE OK: Go to next step
4. CHECK CONNECTORS Check that the connectors are securely connected and the terminals are not deformed or loose. OK The connectors are securely connected and the terminals are not deformed or loose. NG --> REPAIR OR REPLACE CONNECTORS OK: Go to next step
5. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND) Disconnect the ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance Tester Connection (Symbols) Condition Specified Condition J55-6 (GND2) - Body ground Always Below 1 ohms NG --> REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
6. CHECK WIRE HARNESS (BATTERY - POWER SOURCE CONTROL ECU) Measure the volage according to the value(s) in the table below. Standard voltage Tester Connection (Symbols) Condition Specified Condition J55-1 (STP) - Body ground Brake pedal released Below 1 V J55-1 (STP) - Body ground Brake pedal depressed 10 to 14 V OK --> See step 8 NG: Go to next step
7. INSPECT STOP LIGHT SWITCH Remove the switch. Measure the resistance of the switch. Standard resistance Tester Connection Condition Specified Condition 1 - 2 Switch pin free Below 1 ohms 3 - 4 Switch pin free 10 kohms or higher 1 - 2 Switch pin pushed in 10 kohms or higher 3 - 4 Switch pin pushed in Below 1 ohms NG --> REPLACE STOP LIGHT SWITCH OK --> REPAIR OR REPLACE HARNESS OR CONNECTOR
8. READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH) Reconnect the connectors. Check the DATA LIST for proper functioning of the stop light switch. BODY: Tester Display Measurement Item/Range Normal Condition Diagnostic Note Stop Light SW Stop light switch 1/ ON or OFF ON: Brake pedal depressed OFF: Brake pedal released - OK ON (brake pedal depressed) and OFF (brake pedal released) appear on the screen. NG --> REPLACE POWER SOURCE CONTROL ECU OK --> REPLACE ECM