Gateway System: Diagnosis Lexus LS III

HOW TO PROCEED WITH TROUBLESHOOTING

Perform troubleshooting in accordance with the procedure on the flow chart.

DIAGNOSTIC TROUBLE CODE CHART

If a malfunction code is displayed during DTC check, check the circuit corresponding to the code in the table below (Proceed to the page given for the circuit).

DIAGNOSTIC TROUBLE CODE CHART

Locating Door Control System Communication Bus Components. Scheme 26

Locating Instrument Panel System Communication Bus Components. Scheme 27

Locating Light Control System Communication Bus-1 Components. Scheme 28

Locating Light Control System Communication Bus-2 Components. Scheme 29

Locating AVC-LAN System Communication Bus Components. Scheme 30

Identifying ECM Terminals. Scheme 31

Identifying Transponder Key ECU Terminals. Scheme 32

Identifying Combination Meter Terminals. Scheme 33

Identifying Moon Roof Control ECU Terminals. Scheme 34

Identifying Driver Side J/B ECU Terminals. Scheme 35

Identifying Passenger Side J/B ECU Terminals. Scheme 36

Identifying Luggage Roof J/B ECU Terminals. Scheme 37

Identifying Front Light ECU Terminals. Scheme 38

Identifying Driver Door ECU Terminals. Scheme 39

Identifying Passenger Door ECU Terminals. Scheme 40

Identifying Rear Door LH ECU Terminals. Scheme 41

Identifying Rear Door RH ECU Terminals. Scheme 42

Identifying Theft Deterrent ECU Terminals. Scheme 43

Identifying Driver Seat ECU Terminals. Scheme 44

Identifying Rear RH Seat ECU Terminals. Scheme 45

Identifying Rear LH Seat ECU Terminals. Scheme 46

Identifying Combination Switch Terminals. Scheme 47

Identifying Steering Pad Switch Terminals. Scheme 48

Identifying Clearance Sensor ECU Terminals. Scheme 49

Identifying Rain Sensor Terminals. Scheme 50

Identifying Rear Seat Switch Terminals. Scheme 51

Identifying Accessory Bus Buffer Terminals. Scheme 52

Identifying Overhead J/B Terminals. Scheme 53

Identifying Airbag Sensor Assembly Terminals. Scheme 54

Identifying Radio And Player Terminals. Scheme 55

Identifying Tilt And Telescopic ECU Terminals. Scheme 56

Identifying Skid Control ECU Terminals. Scheme 57

Identifying A/C ECU Terminals. Scheme 58

Identifying Gatway ECU Terminals. Scheme 59

PROBLEM SYMPTOMS TABLE

HINT

Related systems are mentioned in (- system).

DIAGNOSTIC TROUBLE CODE DEFINITIONS

A00198067

CIRCUIT DESCRIPTION

This DTC is output when communication stops between the driver door ECU and the gateway ECU.

CIRCUIT DESCRIPTION

This DTC is output when communication stops between the passenger door ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the tilt and telescopic ECU and the gateway ECU.

DTC CHART

This DTC is output when +B or GND short occurs on the door system communication bus.

Identifying Wiring Diagram - R13 Rear Door RH ECU. Scheme 60

Scheme 61

Scheme 62

Scheme 63

1. Check communication circuit inside ECU. PREPARATION: Disconnect the following ECU connectors in order from the top downward. HINT: Before disconnecting the next connector, be sure that disconnected ECU connector is reconnected. ECU CONNECTORS Disconnect ECU connector Connector No. Theft deterrent ECU T5 Transponder key ECU T9 Driver seat ECU D28 Rear seat switch R29 Rear LH seat ECU R27 Driver door ECU D25 Rear door LH ECU R13 Rear door RH ECU R14 Passenger door ECU F17 Rear RH seat ECU R26 Overhead J/B O6 Rain sensor R6 Moon roof control ECU M6 (Scheme 61): Checking DTC Every Time Each Connector Disconnect CHECK: Check the DTC every time each connector is disconnect. OK: DTC B1214 or B1215 is not output. OK: Replace corresponding ECU (ECU for which DTC is deleted is defective.) NG: Go to next step.
2. Check for short circuit between ECUs. PREPARATION: Disconnect the following pairs of ECU connectors simultaneously, from the top downward. HINT: Before disconnecting the next connector, be sure that disconnected ECU connectors are reconnected. The short circuit check can be preformed on the circuit by disconnecting it from the MPX communication bus circuit. If DTC is deleted, this means that the circuit being checked is short circuited and it must be repaired. ECU CONNECTORS CHART Disconnect ECU connector Connector No. Theft deterrent ECU Transponder key ECU T5 T9 Transponder key ECU Driver door ECU T9 D25 Driver door ECU Rear door LH ECU D25 R13 Rear door LH ECU Rear door RH ECU R13 R14 Rear door RH ECU Passenger door ECU R14 F17 Gateway ECU Overhead J/B G3 O6 Gateway ECU Rear RH seat ECU G3 R26 Rain sensor Overhead J/B R6 O6 Moon roof control ECU Overhead J/B M6 O6 (Scheme 62): Checking DTC Every Time Pair Of Connectors Disconnected CHECK: Check the DTC every time a pair of connectors are disconnected. OK: DTC B1214 or B1215 is not output. HINT: If DTC is deleted when the overhead ECU is disconnected, check the overhead J/B. OK: Repair or replace corresponding wire harness. NG: Go to next step.
3. Check for short circuit. PREPARATION: Disconnect the following connectors of ECU. HINT: Before disconnecting the next connector, be sure reconnect the ECU connector that is already disconnected. ECU CONNECTOR CHART Disconnect ECU connector Connector No. Gateway ECU Overhead J/B G3 O6 Gateway ECU Rear RH seat ECU G3 R26 Rain sensor Overhead J/B G3 O6 Moon roof control ECU Overhead J/B M6 O6 (Scheme 63): Checking +B Short And GND Short Between Connectors CHECK: Check whether or not there is +B short and GND short between the above connectors. OK: No +B short and GND short. NG: Repair or replace corresponding wire harness. OK: Replace gateway ECU.

This DTC is output when communication stops between the rear door RH ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the rear door LH ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the rear seat switch and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the gateway ECU and the AVC-LAN circuit.

DTC CHART

Identifying Wiring Diagram - Communication Between Gateway ECU And AVC-LAN. Scheme 64

INSPECTION PROCEDURE

1. Check "Service check mode" of AVC-LAN diagnosis system. CHECK: Connection of the gateway ECU can be checked by AVC-LAN diagnosis. w/o LEXUS navigation system: "Service check mode" of audio system. w/ LEXUS navigation system: "Service check mode" of LEXUS navigation system. See «PRE-CHECK»(ref-198069-S22018083862005101400000) . OK: Radio display or Multi display: G/W: OK (System is normal) G/W: EXCH (Replace gateway ECU) others: Troubleshoot for each diagnosis. EXCH : Replace gateway ECU. Other : Troubleshoot for each diagnosis. OK : Go to next step.
2. Check wire harness. PREPARATION: Pull out the ECU connectors mentioned below. WIRE HARNESS Wire harness side connector of ECU Terminal Gateway ECU - Radio and player GTX+ (G3-9) -TXS+ (R3-3) GTX- (G3-20) - TXS- (R3-6) CHECK: Check continuity of the wire harness between the connectors. OK: Continuity NG : Repair or replace wire harness. OK : Replace gateway ECU.

This DTC is output when communication stops between the ECM and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the A/C ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the luggage room J/B ECU and the gateway ECU.

DTC CHART

This DTC is output when +B or GND short occurs on the instrument panel system communication bus.

Instrument Panel System Communication Bus Malfunction Wiring Diagram. Scheme 65

Scheme 66

Scheme 67

Scheme 68

1. Check communication circuit inside ECU. PREPARATION: Disconnect the following ECU connectors in order from the top downward. HINT: Before disconnecting the next connector, be sure that disconnected ECU connector is reconnected. ECU connectors CHART Disconnect ECU connector Connector No. ECM E2 A/C ECU A11 Center cluster integration panel C6 Combination meter C12 Skid control ECU S12 Airbag sensor assembly A24 Passenger side J/B ECU P4, PH (Scheme 66): ECU Connector Circuit Diagram CHECK: Check the DTC every time each connector is disconnected. OK: DTC B1266 or B1267 is not output. OK: Replace the corresponding ECU, ECU for which DTC is deleted is defective. NG: Go to next step.
2. Check for short circuit between ECUs. PREPARATION: Disconnect the following pairs of ECU connectors simultaneously, from the top downward. HINT: Before disconnecting the next connector, be sure that disconnected ECU connectors are reconnected. The short circuit check can be preformed on the circuit by disconnecting it from the MPX communication bus circuit. If DTC is deleted, this means that the circuit being checked is short-circuited and it must be repaired. ECU CONNECTORS CHART Disconnect ECU connector Connector No. ECM A/C ECU E2 A11 ECM Passenger side J/B ECU E2 P4 Passenger side J/B ECU Airbag sensor assembly P4 PH Airbag sensor assembly Skid control ECU A24 S12 Skid control ECU Combination meter S12 C12 (Scheme 67): ECU Connector Circuit Diagram CHECK: Check the DTC every time a pair of connectors are disconnected. OK: DTC is B1266 or B1267 is not output. OK: Repair or replace corresponding wire harness. NG: Go to next step.
3. Check for short circuit. PREPARATION: Disconnect the following connectors of ECU. HINT: Before disconnecting the next connector, be sure reconnect the ECU connector that is already disconnected. ECU CONNECTOR Disconnect ECU connector Connector No. Gateway ECU Combination meter G3 C12 Gateway ECU A/C ECU (w/o LEXUS navigation system) Center cluster Integration panel (w/ LEXUS navigation system) G3 A11 C6 CHECK: Check whether or not there is +B short and GND short between the above connectors. (Scheme 68): ECU Short Circuit Diagram OK: No +B short and GND short. NG: Repair or replace corresponding wire harness. OK: Repair the gateway ECU.

CIRCUIT INSPECTION

This DTC is output when communication stops between the theft deterrent ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the combination meter ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the driver seat ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the moon roof control ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the accessory bus buffer and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the center cluster integration and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the combination switch ECU and the gateway ECU.

DTC CHART COMBINATION SWITCH ECU AND GATEWAY ECU

This DTC is output when communication stops between the rain sensor and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the airbag sensor assembly and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the skid control ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the driver side J/B ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the passenger side J/B ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the steering pad switch and the gateway ECU.

DTC CHART

This DTC is output when +B or GND short occurs on the rear lights control system communication bus.

Circuit Description Light System Communication Bus Malfunction. Scheme 69

Scheme 70

Scheme 71

Scheme 72

1. Check communication circuit inside ECU. PREPARATION: Disconnect the following connectors of ECU in order from the top downward. HINT: Before disconnecting the next connector, be sure that removed ECU connector is reconnected. ECU CONNECTORS TERMINALS Disconnect ECU connector Connector No. Front light ECU - Luggage room J/B ECU L14 Clearance sonar ECU C17 Combination switch C14 Power tilt and power telescopic ECU P8 Steering pad switch C13 Driver side J/B ECU D3, D5 (Scheme 70): ECU Connector Circuit Diagram CHECK: Check the DTC every time each connector is disconnected. OK: DTC B1291 or B1292 is not output. OK: Replace corresponding ECU, ECU for which DTC is deleted is defective. NG: Go to next step.
2. Check for short circuit between ECUs. PREPARATION: Disconnect the following pairs of ECU connectors simultaneously, from the top downward. HINT: Before disconnecting the next connector, be sure that disconnected ECU connector is reconnected. The short circuit check can be performed on the circuit by disconnecting it from the MPX communication bus circuit If DTC is deleted, this means that the circuit being checked is short-circuited and it must be repaired ECU CONNECTOR TERMINALS Disconnect ECU connector Connector No. Front light ECU Driver side J/B ECU - D3 Luggage room J/B ECU Combination switch L14 C14 Luggage room J/B ECU Clearance sonar ECU L14 C17 Combination switch Power tilt and power telescopic ECU C14 P8 Power tilt and power telescopic ECU Driver side J/B ECU P8 D5 Driver side J/B ECU Steering pad switch D5 C13 (Scheme 71): ECU Connector Circuit Diagram CHECK: Check the DTC every time a pair of connectors are disconnected. OK: DTC B1291 or B1292 is not output. OK: Repair or replace corresponding wire harness. NG: Go to next step.
3. Check for short circuit. PREPARATION: Disconnect the following ECU connectors. HINT: Before disconnecting the next connector, be sure that disconnected ECU connector is reconnected. ECU CONNECTOR TERMINALS Disconnect ECU connector Connector No. Gateway ECU Front light ECU G3 - Gateway ECU Luggage room J/B ECU G3 L14 (Scheme 72): ECU Connector Circuit Diagram CHECK: Check whether or not there is +B short and GND short between the above connector. OK: No +B short and GND short. NG: Repair or replace corresponding wire harness between. OK: Replace gateway ECU.

This DTC is output when communication stops between the Transponder key ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the front light ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the clearance sonar ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the rear RH seat ECU and the gateway ECU.

DTC CHART

This DTC is output when communication stops between the rear LH seat ECU and the gateway ECU.

DTC CHART