Steering Lock System - Diagnosis: Diagnosis Lexus LS III рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

The hand-held tester can be used during steps 3, 8 and 11.

1. VEHICLE BROUGHT TO WORKSHOP
2. CUSTOMER PROBLEM ANALYSIS (SEE «CUSTOMER PROBLEM ANALYSIS CHECK»(ref-209355-S13912854842005120900000) )
3. CHECK AND CLEAR DTCs (SEE «DTC CHECK/CLEAR»(ref-209355-S22571658022005120900000) )
4. PROBLEM SYMPTOM CONFIRMATION SYMPTOM DOES NOT OCCUR (Go to step 5) SYMPTOM OCCURS (Go to step 6 .)
5. SYMPTOM SIMULATION (SEE «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-218525-S26820589962006020700000) )
6. CHECK MULTIPLEX COMMUNICATION SYSTEM (SEE «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-209386-S04462676392005120900000) ) HINT: The steering lock ECU is connected to the multiplex communication system. Therefore, be sure to check that there are no problems in the multiplex communication system before performing troubleshooting.
7. CHECK CAN COMMUNICATION SYSTEM (SEE «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-215645-S23773535752006011600000) ) HINT: This ECU is connected to the CAN communication system. Therefore, be sure to check that there are no troubles in the CAN communication system before performing troubleshooting.
8. DTC CHECK (SEE «DTC CHECK/CLEAR»(ref-209355-S22571658022005120900000) ) DTC IS NOT OUTPUT (Go to step 9) DTC IS OUTPUT (Go to step 10 .)
9. PROBLEM SYMPTOMS TABLE (SEE «PROBLEM SYMPTOMS TABLE»(ref-209355-S00348003782005120900000) ) Go to step 11 .
10. DTC CHART (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-209355-S33313483342005120900000) )
11. CIRCUIT INSPECTION (SEE «DTC B2775 INTERIOR VERIFICATION ABNORMAL (TO THEFT DETERRENT ECU)_»(ref-209355-S03580032382005120900000) to «SHIFT LOCK CONTROL ECU COMMUNICATION CIRCUIT»(ref-209355-S13003602672005120900000) )
12. PROBLEM IDENTIFICATION
13. REPAIR OR REPLACEMENT
14. CONFIRMATION TEST END

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1. STEERING LOCK ECU Wave form 1 Wave form 2 Wave form 3 Wave form 4 Wave form 5

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1. DESCRIPTION DIAGNOSTIC SYSTEM When troubleshooting a vehicle with a diagnostic system, the only difference from the usual troubleshooting procedure is connecting the hand-held tester to the vehicle and reading various data output from the vehicle's steering lock ECU. The steering lock ECU records DTCs when the computer detects a malfunction in the computer itself or in its circuits. To check the DTCs, connect the hand-held tester to the DLC3 on the vehicle. The hand-held tester enables you to erase the DTCs, activate the several actuators and check data list. Check the DLC3. The steering lock ECU follows the CAN and ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. HINT: If the display shows "UNABLE TO CONNECT TO VEHICLE" after connecting the hand-held tester cable to the DLC3 and turning the ignition switch to the ON position, there is a problem with either the vehicle or tester. If communication is normal when connecting the tester to another vehicle, inspect the DLC3 on the original vehicle. If communication is still not possible when connecting the tester to another vehicle, the problem is probably on the tester itself, so consult the Service Department list the tester's operator's manual.

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1. CHECK FOR DTCs Prepare the hand-held tester. Connect the hand-held tester to the DLC3 at the lower part of the instrument panel. Turn the ignition switch to the ON position and turn the hand-held tester on. Use the hand-held tester to check for DTCs, and note or print the result (see the operator manual for operating instructions). See «DIAGNOSTIC TROUBLE CODE CHART»(ref-209355-S33313483342005120900000) to confirm the details of the DTCs.
2. CLEAR DTCs Operate the hand-held tester to clear the DTCs (see the operator manual for operating instructions).

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1. DATA LIST Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position and turn the hand-held tester on. Operate the hand-held tester according to the steps on the display and select "DATA LIST".
2. ACTIVE TEST Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position and turn the hand-held tester on. Following the display on the hand-held tester, perform the "ACTIVE TEST".

DIAGNOSTIC TROUBLE CODE CHART

If a trouble code is displayed during the DTC check, check the circuit listed for that code in the table below.

DIAGNOSTIC TROUBLE CODE CHART

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HINT

1. DTCs B2793, B2794, B2795, B2796, B2797 and/or B2798 are detected for troubles found when the smart key is inserted into the starter switch.
2. DTCs B2793, B2794, B2795, B2796, B2797 and/or B2798 indicate troubles in the steering lock ECU and the transponder key ECU, and the same troubleshooting method is applied to both ECUs. Therefore, if these DTCs are detected, refer to the immobilizer section to conduct troubleshooting (see «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-209373-S04319944452005120900000) ).

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CIRCUIT DESCRIPTION

The steering lock ECU communicates through BEAN with the theft deterrent ECU on whether or not interior verification is performed. The steering lock ECU detects this DTC when a trouble is detected in this communication. The following conditions are also considered as communication errors and this DTC is output.

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1. When either the theft deterrent ECU or the steering lock ECU is replaced, the replaced ECU's COMMUNICATION ID is different from the other ECU's. (Be sure to register the COMMUNICATION ID again when either ECU is replaced.)
2. Interior verification in the theft deterrent ECU fails. (Ex. 1. Interior verification is performed with the key outside the interior verification area, 2. The smart key is in a place where the room oscillator wave cannot reach, 3. The smart key battery is shut off, etc.) This DTC is automatically cleared when the interior verification's normal operation is confirmed in the communication between the steering lock ECU and the theft deterrent ECU. (When smart ignition is performed normally, interior verification operation is considered normal.)

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1. CHECK SMART KEY SYSTEM Clear the stored DTCs in the memory (see «DTC CHECK/CLEAR»(ref-209355-S22571658022005120900000) ). Check that all smart keys the user has can start the engine. Result: A: A SPECIFIC KEY IS FAULTY OR UNREGISTERED HINT: In this case, the following three causes are suspected. Key battery is shut off. Replace the battery. Key is faulty. Replace the key. Key is unregistered. Register the key. B: GO TO NEXT STEP. INTERIOR VERIFICATION-RELATED COMPONENTS ARE FAULTY HINT: In this case, the room oscillator, the wireless tuner and the theft deterrent ECU are probably faulty. Therefore, proceed to the troubleshooting in "Smart ignition cannot be performed" in the problem symptoms table for the theft deterrent system (see «PROBLEM SYMPTOMS TABLE»(ref-209385-S19954184582005120900000) ).

The steering lock ECU monitors the lock/unlock condition of the steering lock bar which locks the steering. This DTC is detected when the lock/unlock position sensor, which monitors this lock/unlock condition, has a trouble or when excessive current is flown to the steering lock motor that activates the shaft.

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1. READ VALUE ON HAND-HELD TESTER Connect the hand-held tester to the DLC 3. Turn the hand-held tester on. Select the item below in the DATA LIST, and read its value displayed on the hand-held tester to check the lock/unlock position sensor. NG: REPLACE LOCK/UNLOCK POSITION SENSOR (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Lock/unlock position switch is built in the steering lock ECU, and it is provided with the steering lock actuator. OK: GO TO NEXT STEP. REPLACE STEERING LOCK ECU (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Steering lock ECU is provided with the steering lock actuator.

The steering lock ECU has two power sources: one is to activate the CPU and the other is to activate motors and other related components.

When power is not applied to +B terminal with power applied to CPUB terminal, this DTC is detected.

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1. INSPECT FUSE (STR LOCK FUSE) Remove the STR LOCK fuse from the passenger side J/B. Check for continuity of the STR LOCK fuse. Standard: Continuity NG: INSPECT FOR SHORT IN ALL COMPONENTS CONNECTED TO FUSE AND REPAIR OR REPLACE THEM IF NEEDED, AND REPLACE FUSE OK: Go to next step.
2. INSPECT STEERING LOCK ECU (+B TERMINAL VOLTAGE) Disconnect the S46 connector from the steering lock ECU. Measure the voltage according to the value (s) in the figure (Scheme 30) below. Standard: OK: REPLACE STEERING LOCK ECU (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Steering lock ECU is provided with the steering lock actuator. NG: Go to next step.
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) Disconnect the S46 connector from the steering lock ECU. Measure the resistance according to the value (s) in the figure (Scheme 32) below. Standard: NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ECU - BODY GROUND) OK: GO TO NEXT STEP. REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ECU - BATTERY)

The steering lock ECU prohibits the starter switch from being turned on when it locks the steering.

The steering lock ECU monitors the interlock cable position. When this position does not change, the steering lock ECU judges that there is an interlock cable cut and detects this DTC.

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1. READ VALUE ON HAND-HELD TESTER Connect the hand-held tester to the DLC3. Turn the ignition switch to the ON position. Turn the hand-held tester on. Select the item below in the DATA LIST, and read the value displayed on the hand-held tester to check the interlock cable position sensor. NG: REPLACE INTERLOCK CABLE POSITION SENSOR (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Interlock cable position sensor is built in the steering lock ECU, and it is provided with the steering lock actuator. OK: Go to next step.
2. INSPECT INTERLOCK CABLE Check that the steering lock is locked. Disconnect the negative (-) battery terminal. NOTE: After the battery terminal is reconnected, it is necessary to initialize some systems (see «REPAIR INSTRUCTION»(ref-218525-S18695760282006020700000) ). Check if the interlock cable is disconnected or not by turning the starter switch to the ACC or ON position. OK: The starter switch cannot be turned to the ACC or ON position. NG: REPLACE INTERLOCK CABLE (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Interlock cable is provided with the steering lock actuator. OK: GO TO NEXT STEP. REPLACE STEERING LOCK ECU (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Steering lock ECU is provided with the steering lock actuator.

This DTC is detected when the steering lock ECU does not detect the "on" condition of the push switch or the key switch even when the starter switch is on. (In normal condition, either the push switch or the key switch should be on when the starter switch is on.)

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1. READ VALUE ON HAND-HELD TESTER Connect the hand-held tester to the DLC 3. Turn the hand-held tester on. Select the item below in the DATA LIST, and read its value displayed on the hand-held tester to check the unlock warning switch. OK: REPLACE STEERING LOCK ECU (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Steering lock ECU is provided with the steering lock actuator. NG: Go to next step.
2. INSPECT UNLOCK WARNING SWITCH ASSY Disconnect the U7 connector from the unlock war switch. Measure the resistance according to the value (s) in the figure (Scheme 39) below. Standard: NG: REPLACE UNLOCK WARNING SWITCH ASSY (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Unlock warning switch assy is provided with the starter switch. OK: Go to next step.
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) Disconnect the S46 connector from the steering lock ECU. Disconnect the U7 connector from the unlock warning switch. Measure the resistance according to the value (s) in the figure (Scheme 41) below. Standard: NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP. REPLACE STEERING LOCK ECU (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Steering lock ECU is provided with the steering lock actuator.

This DTC is output when the ECM detects errors in the communication between the steering lock ECU and the ECM, and in the communication lines.

This is also output if engine start is attempted when the COMMUNICATION ID between the steering lock ECU and the ECM is different.

Before troubleshooting for this DTC, make sure that there is no DTC detected in the theft deterrent ECU and the steering lock ECU. If there is any interior verification-related DTC (B1242, B2775) or key code-related DTC (B279#) detected in the theft deterrent ECU and the steering lock ECU, repair them first.

In some cases, interior verification may fail due to misuse of the smart key function. In such cases, permission to start the engine is not given from the communication between the steering lock ECU and the ECM, resulting in the output of this DTC. If this DTC is output, confirm with the user whether or not the following conditions occurred in the past.

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HINT

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1. In cases 1 and 2, when engine start is attempted, the smart key system performs interior verification again. However, because the smart key is outside the interior verification area, the interior verification fails and permission to start the engine is not given, which results in the DTC output. At this time the steering lock ECU also detects B2775.
2. In case 3, when the starter SW is turned back to the ACC position and then turned to the IG ON position again, interior verification fails and permission to start the engine is not given, which results in the DTC output. At this time the steering lock ECU also detects B2775.

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1. CHECK SMART KEY SYSTEM Clear the stored DTCs in the memory (see «DTC CHECK/CLEAR»(ref-209355-S22571658022005120900000) ). Check whether or not all smart keys the user has can start the engine. Result: A: NO PROBLEM AT THIS TIME HINT: It is suspected that engine start was attempted in the past when interior verification had failed or when the key code was different between the steering lock ECU and the key. B: A SPECIFIC KEY IS FAULTY OR UNREGISTERED C: Go to next step.
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - ECM) Disconnect the S46 connector from the steering lock ECU. Disconnect the E2 connector from the ECM. Measure the resistance according to the value (s) in the figure (Scheme 47) below. Standard: NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP. REPLACE ECM (SEE «REPLACEMENT»(ref-209387-S34299887592005121000000) )

This circuit provides power to operate the steering lock ECU.

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1. INSPECT FUSE (MPX-B1, AM2) Remove the MPX-B1 fuse and AM2 fuse from the passenger side J/B. Check for continuity of the fuses. Standard: Continuity NG: INSPECT FOR SHORT IN ALL COMPONENTS CONNECTED TO FUSE AND REPAIR OR REPLACE THEM IF NEEDED, AND REPLACE FUSE OK: Go to next step.
2. INSPECT STEERING LOCK ECU (CPUB, IG2 TERMINAL VOLTAGE) Disconnect the S46 connector from the steering lock ECU. Measure the voltage according to the value (s) in the figure (Scheme 51) below. Standard: OK: REPLACE STEERING LOCK ECU (SEE «REPLACEMENT»(ref-209430-S35740936172005121000000) ) HINT: Steering lock ECU is provided with the steering lock actuator. NG: Go to next step.
3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND) Disconnect the S46 connector from the steering lock ECU. Measure the resistance according to the value (s) in the figure (Scheme 53) below. Standard: NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ECU - BODY GROUND) OK: GO TO NEXT STEP. REPAIR OR REPLACE HARNESS OR CONNECTOR (STEERING LOCK ECU - BATTERY)

The steering lock ECU monitors the P2 switch (P position signal) of the shift lock control ECU. It sends the P2 switch signals through BEAN to the theft deterrent ECU and the meter ECU in order to give various warnings. (Example of warning: A driver leaves the vehicle without setting the shift lever in the P position. When the driver comes back, a warning is given, telling that the shift lever is not in the P position and the vehicle cannot be driven.)

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1. READ VALUE ON HAND-HELD TESTER Connect the hand-held tester to the DLC 3. Turn the hand-held tester on. Select the item below in the DATA LIST, and read its value displayed on the hand-held tester to check the P2 switch. OK: CHECK COMBINATION METER SYSTEM (SEE «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-209364-S03449953552005120900000) ) NG: Go to next step.
2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - SHIFT LOCK CONTROL ECU SUB-ASSY) Disconnect the S46 connector from the steering lock ECU. Disconnect the S7 connector from the shift lock control ECU sub-assy. Measure the resistance according to the value (s) in the figure (Scheme 57) below. Standard: NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: GO TO NEXT STEP. REPLACE SHIFT LOCK CONTROL ECU SUB-ASSY (SEE «OVERHAUL»(ref-209429-S08269168812005121000000) )