Multiplex Communication: Overview Lexus SC II рестайлинг

DESCRIPTION

This DTC is detected when communication between the AFS ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

AFS ECU Communication - Wiring Diagram. Scheme 1

Scheme 2

Scheme 3

1. INSPECT FUSE (H-LP LVL) Remove the H-LP LVL fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. CHECK WIRE HARNESS (AFS ECU - BATTERY AND BODY GROUND) Disconnect the A31 ECU connector. (Scheme 2): Identifying A31 ECU Connectors Terminal Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Condition Specified Condition A31-2 (IG) - Body ground Ignition switch ON 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition A31-1 (E1) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the A31 and D2 ECU connectors. (Scheme 3): Identifying A31 And D2 ECU Connectors Terminal Remove the front light ECU from the engine room relay block. Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition A31-5 (MPX1) - Relay block front light ECU terminal 6 (MPX2) Below 1 ohms A31-6 (MPX2) - D2-15 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE AFS ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE AFS ECU

This DTC is detected when communication between the multiplex network front door ECU LH and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Driver Door ECU Communication - Wiring Diagram. Scheme 4

Scheme 5

Scheme 6

1. CHECK DOOR WARNING LIGHT (OPERATION) Open the driver door and check that the door warning light (built into combination meter) lights up. OK: Door warning light lights up. OK: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH NG: Go to next step.
2. CHECK WIRE HARNESS (MULTIPLEX NETWORK FRONT DOOR ECU LH - BATTERY AND BODY GROUND) Disconnect the D19 ECU connector. (Scheme 5): Identifying D19 ECU Connector Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition D19-4 (CPUB) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition D19-1 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the D17, P21 and T7 ECU connectors. (Scheme 6): Identifying D17, P21 And T7 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition D17-22 (MPX1) - P21-11 (MPX2) Below 1 ohms D17-30 (MPX2) - T7-13 (MPX) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH

This DTC is detected when communication between the multiplex network front door ECU RH (front passenger door ECU) and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Front Passenger Door ECU Communication - Wiring Diagram. Scheme 7

Scheme 8

Scheme 9

1. CHECK DOOR WARNING LIGHT (OPERATION) Open the front passenger door and check that the door warning light (built into combination meter) lights up. OK: Door warning light lights up. OK: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU RH NG: Go to next step.
2. CHECK WIRE HARNESS (MULTIPLEX NETWORK FRONT DOOR ECU RH - BATTERY AND BODY GROUND) Disconnect the P11 ECU connector. (Scheme 8): Identifying P11 ECU Connectors Terminal Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition P11-4 (CPUB) - Body ground 10 to 14 V P11-6 (BDR) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition P11-1 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the G3, P9 and S18 ECU connectors. (Scheme 9): Identifying G3, P9 And S18 ECU Connectors Terminal Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition P9-22 (MPX1) - G3-15 (MPD2) Below 1 ohms P9-30 (MPX2) - S18-7 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One Is OK B Both are NG C B: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU RH AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU RH

This DTC is detected when communication between the multiplex tilt & telescopic ECU (tilt and telescopic ECU) and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Tilt And Telescopic ECU Communication - Wiring Diagram. Scheme 10

Scheme 11

Scheme 12

1. CHECK POWER TILT AND TELESCOPIC SWITCH (OPERATION) Check that the power tilt and telescopic switch can operate the tilt and telescopic steering column normally. OK: Power tilt and telescopic switch can operate the tilt and telescopic steering column normally. OK: REPLACE MULTIPLEX TILT & TELESCOPIC ECU NG: Go to next step.
2. CHECK WIRE HARNESS (MULTIPLEX TILT & TELESCOPIC ECU - BODY GROUND) Disconnect the T8 ECU connector. (Scheme 11): Identifying T8 ECU Connectors Terminal Measure the resistance and voltage of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition T8-5 (ECUB) - Body ground 10 to 14 V T8-10 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T8-4 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the C11 switch connector. Disconnect the D4 junction block connector. Disconnect the T8 ECU connector. (Scheme 12): Identifying C11 Switch, D4 Junction Block And T8 ECU Connectors Terminal Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T8-7 (MPX1) - D4-7 (MPX2) Below 1 ohms T8-6 (MPX2) - C11-9 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE MULTIPLEX TILT & TELESCOPIC ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE MULTIPLEX TILT & TELESCOPIC ECU

DTC B1214 is detected when +B is short-circuited on the door system communication bus, and DTC B1215 is detected when the body ground is short-circuited on the door system communication bus. Detecting this condition will disable the door system communication bus (BEAN) and a DTC will be output.

DTC DETECTION CONDITION CHART

Door System Communication - Wiring Diagram. Scheme 13

Scheme 14

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

Scheme 26

Scheme 27

Scheme 28

Scheme 29

1. CHECK TRANSPONDER KEY ECU Disconnect the transponder key ECU connector and check for DTCs B1214 and B1215. (Scheme 14): Identifying T13 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPLACE TRANSPONDER KEY ECU (IMMOBILISER ECU) A: Go to next step.
2. CHECK POSITION CONTROL ECU (DRIVER SEAT ECU) Disconnect the position control ECU (driver seat ECU) connector and check for DTCs B1214 and B1215. (Scheme 15): Identifying P21 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPLACE POSITION CONTROL ECU (DRIVER SEAT ECU) A: Go to next step.
3. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - DRIVER SEAT ECU) Disconnect the transponder key ECU and position control ECU (driver seat ECU) connectors, and check for DTCs B1214 and B1215. (Scheme 16): Identifying T13 And P21 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: Go to step 8 A: Go to next step.
4. CHECK MULTIPLEX NETWORK FRONT DOOR ECU RH (FOR PASSENGER SIDE) Disconnect the multiplex network front door ECU RH connector and check for DTCs B1214 and B1215. (Scheme 17): Identifying P9 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU RH (FOR PASSENGER SIDE) A: Go to next step.
5. CHECK WIRE HARNESS (DRIVER SEAT ECU - MULTIPLEX NETWORK FRONT DOOR ECU RH) Disconnect the multiplex network front door ECU RH and position control ECU (driver seat ECU) connectors, and check for DTCs B1214 and B1215. (Scheme 18): Identifying P9 And P21 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: Go to step 12 A: Go to next step.
6. CHECK WIRE HARNESS (NETWORK GATEWAY ECU - TRANSPONDER KEY ECU) Disconnect the G3 and T13 ECU connectors. (Scheme 19): Identifying G3 And T13 ECU Connectors Terminal Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition G3-4 (MPD1) - T13-5 (MPX2) Below 1 ohms G3-4 (MPD1) - Body ground 10 kohms or higher T13-5 (MPX2) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
7. CHECK WIRE HARNESS (NETWORK GATEWAY ECU - MULTIPLEX NETWORK FRONT DOOR ECU RH) Disconnect the G3 and P9 ECU connectors. (Scheme 20): Identifying G3 And P9 ECU Connectors Terminal Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition G3-15 (MPD2) - P9-22 (MPX1) Below 1 ohms G3-15 (MPD2) - Body ground 10 kohms or higher P9-22 (MPX1) - Body ground 10 kohms or higher NG: Go to step 16 OK: REPLACE NETWORK GATEWAY ECU
8. CHECK THEFT WARNING ECU Disconnect the theft warning ECU connector and check for DTCs B1214 and B1215. (Scheme 21): Identifying T7 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPLACE THEFT WARNING ECU A: Go to next step.
9. CHECK WIRE HARNESS (THEFT WARNING ECU - TRANSPONDER KEY ECU) Disconnect the transponder key ECU and theft warning ECU connectors, and check for DTCs B1214 and B1215. (Scheme 22): Identifying T13 And T7 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to next step.
10. CHECK MULTIPLEX NETWORK FRONT DOOR ECU LH (FOR DRIVER SIDE) Disconnect the multiplex network front door ECU LH connector and check for DTCs B1214 and B1215. (Scheme 23): Identifying D17 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPLACE MULTIPLEX NETWORK FRONT DOOR ECU LH (FOR DRIVER SIDE) A: Go to next step.
11. CHECK WIRE HARNESS (THEFT WARNING ECU - MULTIPLEX NETWORK FRONT DOOR ECU LH) Disconnect the multiplex network front door ECU LH and theft warning ECU connectors, and check for DTCs B1214 and B1215. (Scheme 24): Identifying T7 And D17 ECU Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR (THEFT WARNING ECU - MULTIPLEX NETWORK FRONT DOOR ECU LH) A: REPAIR OR REPLACE HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT DOOR ECU LH - POSITION CONTROL ECU)
12. CHECK POSITION CONTROL ECU (PASSENGER SEAT ECU) Disconnect the position control ECU (passenger seat ECU) connector and check for DTCs B1214 and B1215. (Scheme 25): Identifying P23 ECU Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPLACE POSITION CONTROL ECU (PASSENGER SEAT ECU) A: Go to next step.
13. CHECK WIRE HARNESS (DRIVER SEAT ECU - PASSENGER SEAT ECU) Disconnect the position control ECU (passenger seat ECU) and position control ECU (driver seat ECU) connectors, and check for DTCs B1214 and B1215. (Scheme 26): Identifying P23 And P21 ECU Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to next step.
14. CHECK SLIDING ROOF CONTROL ECU Disconnect the sliding roof control ECU connector and check for DTCs B1214 and B1215. (Scheme 27): Identifying S18 ECU Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPLACE SLIDING ROOF CONTROL ECU A: Go to next step.
15. CHECK WIRE HARNESS (PASSENGER SEAT ECU - SLIDING ROOF CONTROL ECU) Disconnect the position control ECU (passenger seat ECU) and sliding roof control ECU connectors, and check for DTCs B1214 and B1215. (Scheme 28): Identifying P23 And S18 ECU Connectors Terminal Result RESULT CHART Result Proceed to DTCs 81214 or B1215 is output A DTCs B1214 and B1215 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR (PASSENGER SEAT ECU SLIDING ROOF CONTROL ECU) A: REPAIR OR REPLACE HARNESS AND CONNECTOR (SLIDING ROOF CONTROL ECU MULTIPLEX NETWORK FRONT DOOR ECU)
16. INSPECT PASSENGER SIDE JUNCTION BLOCK Disconnect the 3C and 31 connectors from the passenger side junction block. (Scheme 29): Identifying 3C And 31 Connectors Of Passenger Side Junction Block Measure the resistance of the junction block connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition 3C-18 - 3I-7 Below 1 ohms NG: REPLACE PASSENGER SIDE JUNCTION BLOCK OK: REPAIR OR REPLACE HARNESS AND CONNECTOR

This DTC is detected when communication between the tire pressure monitor receiver and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Tire Pressure Monitor Receiver Communication - Wiring Diagram. Scheme 30

Scheme 31

Scheme 32

1. INSPECT FUSE (MPX-B2) Remove the MPX-B2 fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. CHECK WIRE HARNESS (TIRE PRESSURE MONITOR RECEIVER - BATTERY AND BODY GROUND) Disconnect the T9 receiver connector. (Scheme 31): Identifying T9 Receiver Connectors Terminal Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition T9-1 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T9-6 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the A9 and G3 ECU connectors. Disconnect the T9 receiver connector. (Scheme 32): Identifying A9 And G3 ECU Connectors And T9 Receiver Connector Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T9-2 (MPX1) - G3-5 (MPI1) Below 1 ohms T9-3 (MPX2) - A9-10 (MPX-) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY

This DTC is detected when communication is impossible between the radio receiver assembly and network gateway ECU.

DTC DETECTION CONDITION CHART

AVC-LAN Communication - Wiring Diagram. Scheme 33

Scheme 34

1. CHECK OPERATION (STEERING PAD SWITCH) Check that the steering pad switch can operate the audio system normally. OK: Steering pad switch can operate the audio system normally. OK: REPLACE RADIO RECEIVER ASSEMBLY NG: Go to next step.
2. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the G3 ECU connector. Disconnect the R1 receiver connector. (Scheme 34): Identifying G3 ECU Connector And R1 Receiver Connector Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition R1-3 (TXS+) - G3-9 (GTX+) Below 1 ohms R1-6 (TXS-) - G3-20 (GTX-) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE RADIO RECEIVER ASSEMBLY AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE RADIO RECEIVER ASSEMBLY

This DTC is detected when communication between the A/C amplifier and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

A/C ECU Communication - Wiring Diagram. Scheme 35

Scheme 36

Scheme 37

1. CHECK OPERATION (A/C SWITCH) Check that the A/C switch can operate the A/C normally. OK: A/C switch can operate the A/C normally. OK: REPLACE A/C AMPLIFIER ASSEMBLY NG: Go to next step.
2. CHECK WIRE HARNESS (A/C AMPLIFIER - BATTERY AND BODY GROUND) Disconnect the A10 amplifier connector. (Scheme 36): Identifying A10 Amplifier Connectors Terminal Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition A10-8 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition A10-14 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the A9 and A10 amplifier connectors. Disconnect the P6 ECU connector. (Scheme 37): Identifying A9 And A10 Amplifier Connectors And P6 ECU Connector Disconnect the T9 receiver connector. Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition A10-13 (MPX+) - P6-4 (MPX-) Below 1 ohms A9-10 (MPX-) - T9-3 (MPX2) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE A/C AMPLIFIER ASSEMBLY AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE A/C AMPLIFIER ASSEMBLY

B1263 will be output when the communication between the luggage room junction block ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Luggage Room Junction Block ECU Communication - Wiring Diagram. Scheme 38

Scheme 39

Scheme 40

1. CHECK WIRE HARNESS (LUGGAGE ROOM JUNCTION BLOCK ECU - BATTERY AND BODY GROUND) (Scheme 39): Identifying 6A And 6F Junction Block Connectors And L24 ECU Connector Disconnect the 6A and 6F junction block connectors. Disconnect the L24 ECU connector. Measure the resistance and voltage of the wire harness side connectors. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition 6F-12 (MPX-B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition 6A-2 (P-GND) - Body ground Below 1 ohms 6A-5 (P-GND) - Body ground Below 1 ohms L24-5 (SG) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
2. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the C11 switch connector. Disconnect the G3 and L24 ECU connectors. (Scheme 40): Identifying C11 Switch Connector And G3 And L24 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition L24-2 (MPX+) - C11-10 (MPX2) Below 1 ohms L24-13 (MPX-) - G3-6 (MPL1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE LUGGAGE ROOM JUNCTION BLOCK ASSEMBLY

DTC B1266 is detected when +B is short-circuited on the instrument panel system communication bus, and DTC B1267 is detected when the body ground is short-circuited on the instrument panel system communication bus. Detecting this condition will disable the instrument panel system communication bus (BEAN) and a DTC will be output.

DTC DETECTION CONDITION CHART

Instrument Panel System Communication Bus Malfunction - Wiring Diagram. Scheme 41

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

Scheme 51

Scheme 52

Scheme 53

Scheme 54

Scheme 55

1. CHECK TIRE PRESSURE MONITOR RECEIVER ASSEMBLY Disconnect the tire pressure monitor receiver connector and check for DTCs B1266 and B1267. (Scheme 42): Identifying T9 Connectors Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY A: Go to next step.
2. CHECK PASSENGER SIDE JUNCTION BLOCK ECU Disconnect the 3H passenger side junction block connector. Disconnect the P6 passenger side junction block ECU connector and check for DTCs B1266 and B1267. (Scheme 43): Identifying 3H And P6 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPLACE PASSENGER SIDE JUNCTION BLOCK ECU A: Go to next step.
3. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR RECEIVER - PASSENGER SIDE JUNCTION BLOCK ECU) Disconnect the tire pressure monitor receiver and passenger side junction block ECU connectors, and check for DTCs B1266 and B1267. (Scheme 44): Identifying T9 And P6 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: Go to step 8 A: Go to next step.
4. CHECK COMBINATION METER ASSEMBLY Disconnect the combination meter connector and check for DTCs B1266 and B1267. (Scheme 45): Identifying C8 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPLACE COMBINATION METER ASSEMBLY A: Go to next step.
5. CHECK WIRE HARNESS (PASSENGER SIDE JUNCTION BLOCK ECU - COMBINATION METER) Disconnect the combination meter and passenger side junction block ECU connectors, and check for DTCs B1266 and B1267. (Scheme 46): Identifying Combination Meter And Junction Block ECU Connectors Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: Go to step 10 A: Go to next step.
6. CHECK WIRE HARNESS (NETWORK GATEWAY ECU - TIRE PRESSURE MONITOR RECEIVER) Disconnect the G3 ECU connector. Disconnect the T9 receiver connector. (Scheme 47): Identifying G3 ECU Connector And T9 Connectors Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Switch Condition Specified Condition G3-4 (MPI1) - T9-2 (MPX1) Always Below 1 ohms G3-4 (MPI1) - Body ground Always 10 kohms or higher T9-2 (MPX1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
7. CHECK WIRE HARNESS (NETWORK GATEWAY ECU - COMBINATION METER) Disconnect the G3 ECU connector. Disconnect the C8 meter connector. (Scheme 48): Identifying G3 ECU Connector And C8 Meter Connector Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Switch Condition Specified Condition G3-13 (MPI2) - C8-2 (MPX+) Always Below 1 ohms G3-13 (MPI2) - Body ground Always 10 kohms or higher C8-2 (MPX+) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE NETWORK GATEWAY ECU
8. CHECK A/C AMPLIFIER ASSEMBLY (A/C ECU) Disconnect the A/C amplifier connectors and check for DTCs B1266 and B1267. (Scheme 49): Identifying A9 And A10 A/C Amplifier Connectors Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPLACE A/C AMPLIFIER ASSEMBLY (A/C ECU) A: Go to next step.
9. CHECK WIRE HARNESS (TIRE PRESSURE MONITOR RECEIVER - A/C AMPLIFIER) Disconnect the tire pressure monitor receiver and A/C amplifier connectors, and check for DTCs B1266 and B1267. (Scheme 50): Identifying Tire Pressure Monitor Receiver And A/C Amplifier Connectors Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR RECEIVER - A/C AMPLIFIER) A: REPAIR OR REPLACE HARNESS AND CONNECTOR (A/C AMPLIFIER - PASSENGER SIDE JUNCTION BLOCK ECU)
10. CHECK CENTER AIRBAG SENSOR Disconnect the A21 center airbag sensor connector and check for DTCs B1266 and B1267. (Scheme 51): Identifying A21 Center Airbag Sensor Connector Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPLACE CENTER AIRBAG SENSOR ASSEMBLY A: Go to next step.
11. CHECK WIRE HARNESS (PASSENGER SIDE JUNCTION BLOCK ECU - CENTER AIRBAG SENSOR) Disconnect the center airbag sensor and passenger side junction block ECU connectors, and check for DTCs B1266 and B1267. (Scheme 52): Identifying Center Airbag Sensor And Junction Block ECU Connectors Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to next step.
12. CHECK SKID CONTROL ECU ASSEMBLY Disconnect the skid control ECU connectors and check for DTCs B1266 and B1267. (Scheme 53): Identifying S6 And S7 Skid Control ECU Connectors Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B B: REPLACE SKID CONTROL ECU ASSEMBLY A: Go to next step.
13. CHECK WIRE HARNESS (CENTER AIRBAG SENSOR - SKID CONTROL ECU) Disconnect the center airbag sensor and skid control ECU connectors, and check for DTCs B1266 and B1267. (Scheme 54): Identifying Center Airbag Sensor And Skid Control ECU Connectors Result RESULT CHART Result Proceed to DTCs B1266 or B1267 is output A DTCs B1266 and B1267 are not output B A: REPAIR OR REPLACE HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER) B: Go to next step.
14. INSPECT DRIVER SIDE JUNCTION BLOCK Disconnect the 2F and 2H connectors from the driver side junction block. (Scheme 55): Identifying 2F And 2H Connectors Of Driver Side Junction Block Measure the resistance according to the value(s) in the table below. Standard resistance RESISTANCE SPECIFICATION Tester Connection Switch Condition Specified Condition 2F-13 - 2H-3 Always Below 1 ohms NG: REPLACE DRIVER SIDE JUNCTION BLOCK OK: REPAIR OR REPLACE HARNESS AND CONNECTOR (CENTER AIRBAG SENSOR - SKID CONTROL ECU)

This DTC is detected when communication between the theft warning ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Theft Warning ECU Communication - Wiring Diagram. Scheme 56

Scheme 57

Scheme 58

1. INSPECT FUSE (MPX-B1) Remove the MPX-B1 fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. CHECK WIRE HARNESS (THEFT WARNING ECU - BATTERY AND BODY GROUND) Disconnect the T7 ECU connector. (Scheme 57): Identifying T7 ECU Connectors Terminal Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition T7-1 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T7-20 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the D17, T7 and T13 ECU connectors. (Scheme 58): Identifying D17, T7 And T13 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T7-13 (MPX) - D17-30 (MPX2) Below 1 ohms T7-33 (MPX2) - T13-4 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE THEFT WARNING ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE THEFT WARNING ECU

This DTC is detected when communication between the combination meter and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Combination Meter ECU Communication - Wiring Diagram. Scheme 59

Scheme 60

Scheme 61

1. CHECK TACHOMETER (OPERATION) Check that the tachometer can operate properly while the engine is idling. OK: Tachometer can operate properly while the engine is idling. OK: REPLACE COMBINATION METER ASSEMBLY NG: Go to next step.
2. CHECK WIRE HARNESS (COMBINATION METER - BATTERY AND BODY GROUND) Disconnect the C8 meter connector. (Scheme 60): Identifying C8 Meter Connector Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition C8-12 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition C8-11 (ES) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the C8 meter connector. Disconnect the G3 and S6 ECU connectors. (Scheme 61): Identifying C8 Meter Connector And G3 And S6 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition C8-2 (MPX+) - G3-16 (MPI2) Below 1 ohms C8-3 (MPX-) - S6-17 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE COMBINATION METER ASSEMBLY AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE COMBINATION METER ASSEMBLY

This DTC is detected when communication between the position control ECU (driver seat ECU) and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Power Seat ECU Communication - Wiring Diagram. Scheme 62

Scheme 63

Scheme 64

1. CHECK MANUAL SWITCH (OPERATION) Check that the manual switch of the front power seat can move the driver side seat normally. OK: Manual switch of the front power seat can move the driver side seat normally. OK: REPLACE POSITION CONTROL ECU NG: Go to next step.
2. CHECK WIRE HARNESS (POSITION CONTROL ECU - BATTERY AND BODY GROUND) Disconnect the P21 and P22 ECU connectors. (Scheme 63): Identifying P21 And P22 ECU Connectors Measure the resistance and voltage of the wire harness side connectors. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition P21-9 (SYSB) - Body ground 10 to 14 V P22-8 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition P22-7 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the D17, P21 and P23 ECU connectors. (Scheme 64): Identifying D17, P21 And P23 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition P21-10 (MPX1) - P23-11 (MPX2) Below 1 ohms P21-11 (MPX2) - D17-22 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE POSITION CONTROL ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE POSITION CONTROL ECU (DRIVER SEAT ECU)

This DTC is detected when communication between the sliding roof control ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Sliding Roof ECU Communication - Wiring Diagram. Scheme 65

Scheme 66

Scheme 67

1. CHECK LUGGAGE DOOR OPENING SWITCH ASSEMBLY (OPERATION) Check that the luggage door opening switch can operate the retractable hardtop normally. OK: Luggage door opening switch can operate retractable hardtop normally. OK: REPLACE SLIDING ROOF CONTROL ECU NG: Go to next step.
2. CHECK WIRE HARNESS (SLIDING ROOF CONTROL ECU - BATTERY AND BODY GROUND) Disconnect the S18 and S19 ECU connectors. (Scheme 66): Identifying S18 And S19 ECU Connectors Measure the resistance and voltage of the wire harness side connectors. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition S19-8 (CPUB) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition S18-5 (E5) - Body ground Below 1 ohms S18-6 (E1) - Body ground Below 1 ohms S19-9 (E2) - Body ground Below 1 ohms S19-10 (E3) - Body ground Below 1 ohms S19-11 (E4) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the P9, P23 and S18 ECU connectors. (Scheme 67): Identifying P9, P23 And S18 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition S18-7 (MPX1) - P9-30 (MPX2) Below 1 ohms S18-1 (MPX2) - P23-10 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE SLIDING ROOF CONTROL ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE SLIDING ROOF CONTROL ECU

This DTC is detected when communication between the turn signal switch (combination switch) and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Combination Switch ECU Communication - Wiring Diagram. Scheme 68

Scheme 69

Scheme 70

1. CHECK COMBINATION SWITCH ASSEMBLY (OPERATION) Check that the turn signal switch can operate the turn signal light normally. OK: Turn signal switch can operate the turn signal light normally. OK: REPLACE TURN SIGNAL SWITCH ASSEMBLY NG: Go to next step.
2. CHECK WIRE HARNESS (TURN SIGNAL SWITCH - BATTERY AND BODY GROUND) Disconnect the C11 switch connector. (Scheme 69): Identifying C11 Switch Connector Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition C11-1 (B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition C11-8 (E) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the C11 switch connector. Disconnect the L24 and T8 ECU connectors. (Scheme 70): Identifying C11 Switch Connector And L24 And T8 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition C11-9 (MPX1) - T8-6 (MPX2) Below 1 ohms C11-10 (MPX2) - L24-2 (MPX+) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE TURN SIGNAL SWITCH ASSEMBLY AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE TURN SIGNAL SWITCH ASSEMBLY

This DTC is detected when communication between the center airbag sensor and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Airbag ECU Communication - Wiring Diagram. Scheme 71

Scheme 72

Scheme 73

1. CHECK OPERATION (SRS WARNING LIGHT) Start the engine and check that the SRS warning light on the combination meter turns off. OK: SRS warning light on the combination meter turns off. OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY NG: Go to next step.
2. CHECK WIRE HARNESS (CENTER AIRBAG SENSOR - BATTERY AND BODY GROUND) Disconnect the A21 sensor connector. (Scheme 72): Identifying A21 Sensor Connector Measure the resistance and voltage of the wire harness and connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Condition Specified Condition A21-21 (IG2) - Body ground Ignition switch ON 11 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition A21-25 (E1) - Body ground Below 1 ohms A21-26 (E2) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the 3H junction block connector. Disconnect the A21 sensor connector. Disconnect the S7 ECU connector. (Scheme 73): Identifying 3H Junction Block, A21 Sensor And S7 ECU Connector Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition A21-13 (MPX1) - S7-3 (MPX2) Below 1 ohms A21-22 (MPX2) - 3H-2 (AIRBAG) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE CENTER AIRBAG SENSOR ASSEMBLY AND REPAIR OR REPLACE HARNESS OR CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE CENTER AIRBAG SENSOR ASSEMBLY

This DTC is detected when communication between the skid control ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Skid Control ECU Communication - Wiring Diagram. Scheme 74

Scheme 75

Scheme 76

1. INSPECT FUSE (ABS-IG, IGN) Remove the ABS-IG fuse from the driver side junction block. Remove the IGN fuse from the engine room No. 2 relay block. Measure the resistance of the fuse. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition ABS-IG fuse Below 1 ohms IGN fuse Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND) Disconnect the S5, S6, S7 and S8 ECU connectors. (Scheme 75): Identifying S5, S6, S7 And S8 ECU Connectors Measure the voltage and resistance of the wire harness side connectors. Standard voltage VOLTAGE SPECIFICATION Tester Connection Condition Specified Condition S6-6 (IG2) - Body ground Ignition switch ON 11 to 14 V S7-6 (IG1) - Body ground Ignition switch ON 11 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition S5-16 (GND4) - Body ground Below 1 ohms S5-22 (GND3) - Body ground Below 1 ohms S8-6 (GND2) - Body ground Below 1 ohms S8-31 (GND1) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the A21 sensor connector. Disconnect the C8 meter connector. Disconnect the S6 and S7 ECU connectors. (Scheme 76): Identifying A21 Sensor, C8 Meter And S6 And S7 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition S6-17 (MPX1) - C8-3 (MPX-) Below 1 ohms S7-3 (MPX2) - A21-13 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE SKID CONTROL ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE SKID CONTROL ECU

This DTC is detected when communication between the driver side junction block ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Driver Side Junction Block ECU Communication - Wiring Diagram. Scheme 77

Scheme 78

Scheme 79

1. INSPECT FUSE (MPX-B3) Remove the MPX-B3 fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK ECU - BATTERY AND BODY GROUND)) Disconnect the 2G junction block connector. Disconnect the D4 ECU connector. (Scheme 78): Identifying 2G Junction Block Connector And D4 ECU Connector Measure the voltage and resistance of the wire harness side connectors. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition D4-5 (MPX-B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition D4-1 (GND2) - Body ground Below 1 ohms 2G-8 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the D2, D4, T8 and A31 ECU connectors. (Scheme 79): Identifying D2, D4, T8 And A31 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition D2-15 (MPX1) - A31 -6 (MPX2) Below 1 ohms D4-7 (MPX2) - T8-7 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE DRIVER SIDE JUNCTION BLOCK AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE DRIVER SIDE JUNCTION BLOCK

This DTC is detected when communication between the passenger side junction block ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Passenger Side Junction Block ECU Communication - Wiring Diagram. Scheme 80

Scheme 81

Scheme 82

1. INSPECT FUSE (D/C CUT, MPX-B2) Remove the D/C CUT fuse from the engine room No. 1 relay block. Remove the MPX-B2 fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition D/C CUT fuse Below 1 ohms MPX-B2 fuse Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. CHECK WIRE HARNESS (PASSENGER SIDE JUNCTION BLOCK ECU - BATTERY AND BODY GROUND) Disconnect the 3E and 3G junction block connectors. Disconnect the P4 ECU connector. (Scheme 81): Identifying 3E And 3G Junction Block And P4 ECU Connector Measure the voltage and resistance of the wire harness side connectors. Standard voltage VOLTAGE SPECIFICATION Tester Connection Condition Specified Condition 3E-16 (MPX-B) - Body ground Always 11 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition 3G-8 (GND) - Body ground Below 1 ohms P4-11 (GND1) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the 3H junction block connector. Disconnect the A21 sensor connector. Disconnect the A10 amplifier connector. Disconnect the P6 ECU connector. (Scheme 82): Identifying 3H Junction Block, A21 Sensor, A10 Amplifier Connector And P6 ECU Connector Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition 3H-2 (AIRBAG) - A21-22 (MPX2) Below 1 ohms P6-4 (MPX-) - A10-13 (MPX+) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE PASSENGER SIDE JUNCTION BLOCK AND REPAIR OR REPLACE HARNESS OR CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE PASSENGER SIDE JUNCTION BLOCK

This DTC is detected when communication between the steering pad switch modulator and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Steering Pad Switch Communication - Wiring Diagram. Scheme 83

Scheme 84

Scheme 85

1. CHECK OPERATION (STEERING PAD SWITCH) Check that the steering pad switch can operate the audio system normally. OK: Steering pad switch can operate the audio system normally. OK: REPLACE STEERING PAD SWITCH MODULATOR NG: Go to next step.
2. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the C10 modulator connector. Disconnect the D4 ECU connector. (Scheme 84): Identifying C10 Modulator Connector And D4 ECU Connector Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition C10-3 (MPX) - D4-6 (MPX3) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. INSPECT FUSE (PANEL, SECURITY) Remove the PANEL and SECURITY fuses from driver side junction block. Measure the resistance of the fuses. OK: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
4. CHECK WIRE HARNESS (STEERING PAD SWITCH MODULATOR - BATTERY AND BODY GROUND) Disconnect the C10 modulator connector. (Scheme 85): Identifying C10 Modulator Connector Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition C10-2 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition C10-4 (ECC) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE STEERING PAD SWITCH MODULATOR

This DTC is detected when communication between the position control ECU (passenger seat ECU) and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Passenger Seat ECU Communication - Wiring Diagram. Scheme 86

Scheme 87

Scheme 88

1. CHECK OPERATION Check that the manual switch of the front power seat can move the passenger side seat normally. OK: Manual switch of the front power seat can move the passenger side seat normally. OK: REPLACE POSITION CONTROL ECU NG: Go to next step.
2. CHECK WIRE HARNESS (POSITION CONTROL ECU - BATTERY AND BODY GROUND) Disconnect the P23 and P24 ECU connectors. (Scheme 87): Identifying P23 And P24 ECU Connectors Measure the voltage and resistance of the wire harness side connectors. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition P23-9 (SYSB) - Body ground 10 to 14 V P24-8 (+B) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition P24-7 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the P21, P23 and S18 ECU connectors. (Scheme 88): Identifying P21, P23 And S18 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition P23-10 (MPX1) - S18-1 (MPX2) Below 1 ohms P23-11 (MPX2) - P21-10 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE POSITION CONTROL ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE POSITION CONTROL ECU

DTC B1291 is detected when +B is short-circuited on the light system (steering column bus) communication bus, and DTC B1292 is detected when the body ground is short-circuited on the light system (steering column bus) communication bus. Detecting this condition will disable the light system communication bus (BEAN) and a DTC will be output.

DTC DETECTION CONDITION CHART

Light System Communication - Wiring Diagram. Scheme 89

Scheme 90

Scheme 91

Scheme 92

Scheme 93

Scheme 94

Scheme 95

Scheme 96

Scheme 97

Scheme 98

Scheme 99

Scheme 100

Scheme 101

Scheme 102

Scheme 103

Scheme 104

1. CHECK LUGGAGE ROOM JUNCTION BLOCK ECU Disconnect the luggage room junction block ECU connector and check for DTCs B1291 and B1292. (Scheme 90): Identifying Luggage Room Junction Block ECU Connector Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPLACE LUGGAGE ROOM JUNCTION BLOCK ECU A: Go to next step.
2. CHECK MULTIPLEX NETWORK FRONT LIGHT ECU Disconnect the engine room No. 2 relay block (multiplex network front light ECU) connector and check for DTCs B1291 and B1292. (Scheme 91): Identifying Luggage Room Junction Block ECU Connector Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU A: Go to next step.
3. CHECK WIRE HARNESS (MULTIPLEX NETWORK FRONT LIGHT ECU - LUGGAGE ROOM JUNCTION BLOCK ECU) (Scheme 92): Identifying Luggage Room Junction Block ECU And Multiplex Network Front Light ECU Connectors Disconnect the luggage room junction block ECU and multiplex network front light ECU connectors, and check for DTCs B1291 and B1292. Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: Go to step 5 A: Go to next step.
4. CHECK WIRE HARNESS CONNECTED TO NETWORK GATEWAY ECU (Scheme 93): Identifying Engine Room No. 2 Relay Block Connector And G3 And L24 ECU Connectors Disconnect the engine room No. 2 relay block (front light ECU) connector. Disconnect the G3 and L24 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition G3-17 (MPL2) - Relay block front light ECU terminal 5 (MPX1) Below 1 ohms G3-6 (MPL1) - L24-13 (MPX-) Below 1 ohms G3-17 (MPL2) - Body ground 10 kohms or higher G3-6 (MPL1) - Body ground 10 kohms or higher Relay block front light ECU terminal 5 (MPX1) - Body ground 10 kohms or higher L24-13 (MPX-) - Body ground 10 kohms or higher NG: Go to step 15 OK: REPLACE NETWORK GATEWAY ECU
5. CHECK TURN SIGNAL SWITCH ASSEMBLY (COMBINATION SWITCH) Disconnect the turn signal switch connector and check for DTCs B1291 and B1292. (Scheme 94): Identifying Turn Signal Switch Connector Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPLACE TURN SIGNAL SWITCH ASSEMBLY (COMBINATION SWITCH) A: Go to next step.
6. CHECK WIRE HARNESS (TURN SIGNAL SWITCH - LUGGAGE ROOM JUNCTION BLOCK ECU) (Scheme 95): Identifying Luggage Room Junction Block ECU And Turn Signal Switch Connectors Disconnect the luggage room junction block ECU and turn signal switch connectors, and check for DTCs B1291 and B1292. Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to next step.
7. CHECK MULTIPLEX TILT & TELESCOPIC ECU Disconnect the multiplex tilt & telescopic ECU connector and check for DTCs B1291 and B1292. (Scheme 96): Identifying T8 Connectors Terminal Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPLACE MULTIPLEX TILT & TELESCOPIC ECU A: Go to next step.
8. CHECK WIRE HARNESS (TURN SIGNAL SWITCH - MULTIPLEX TILT & TELESCOPIC ECU) Disconnect the turn signal switch and multiplex tilt & telescopic ECU connectors, and check for DTCs B1291 and B1292. (Scheme 97): Identifying Turn Signal Switch And Multiplex Tilt And Telescopic ECU Connectors Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to next step.
9. CHECK STEERING PAD SWITCH MODULATOR (STEERING PAD SWITCH) Disconnect the steering pad switch modulator connector and check for DTCs B1291 and B1292. (Scheme 98): Identifying C10 Steering Pad Switch Modulator Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPLACE STEERING PAD SWITCH MODULATOR (STEERING PAD SWITCH) A: Go to next step.
10. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK ECU - STEERING PAD SWITCH) (Scheme 99): Identifying Driver Side Junction Block ECU And Steering Pad Switch Modulator Connectors Disconnect the driver side junction block ECU and steering pad switch modulator connectors, and check for DTCs B1291 and B1292. Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to next step.
11. CHECK DRIVER SIDE JUNCTION BLOCK (DRIVER SIDE JUNCTION BLOCK ECU) Disconnect the driver side junction block ECU connectors and check for DTCs B1291 and B1292. (Scheme 100): Identifying Driver Side Junction Block ECU Connectors Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPLACE DRIVER SIDE JUNCTION BLOCK ECU A: Go to next step.
12. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK ECU - MULTIPLEX TILT AT TELESCOPIC ECU) Disconnect the driver side junction block ECU and multiplex tilt & telescopic ECU connectors, and check for DTCs B1291 and B1292. (Scheme 101): Identifying Driver Side Junction Block ECU And Multiplex Tilt And Telescopic ECU Connectors Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR A: Go to next step.
13. CHECK AFS ECU Disconnect the AFS ECU connector and check for DTCs B1291 and B1292. (Scheme 102): Identifying (A31) AFS ECU Connector Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPLACE AFS ECU A: Go to next step.
14. CHECK WIRE HARNESS (DRIVER SIDE JUNCTION BLOCK ECU - AFS ECU) Disconnect the driver side junction block ECU and AFS ECU connectors, and check for DTCs B1291 and B1292. (Scheme 103): Identifying Driver Side Junction Block ECU And AFS ECU Connectors Result RESULT CHART Result Proceed to DTCs B1291 or B1292 are output A DTCs B1291 or B1292 are not output B B: REPAIR OR REPLACE HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ECU - AFS ECU) A: REPAIR OR REPLACE HARNESS AND CONNECTOR (MULTIPLEX NETWORK FRONT LIGHT ECU - AFS ECU)
15. INSPECT PASSENGER SIDE JUNCTION BLOCK Disconnect the 3C and 3E connectors from the passenger side junction block. (Scheme 104): Identifying 3C And 3E Connectors Of Passenger Side Junction Block Measure the resistance of the junction block connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition 3C-8 - 3E-10 Below 1 ohms NG: REPLACE PASSENGER SIDE JUNCTION BLOCK OK: REPAIR OR REPLACE HARNESS AND CONNECTOR

This DTC is detected when communication between the transponder key ECU (immobiliser ECU) and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Immobiliser ECU Communication - Wiring Diagram. Scheme 105

Scheme 106

Scheme 107

1. INSPECT FUSE (MPX-B1) Remove the MPX-B1 fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
2. CHECK WIRE HARNESS (TRANSPONDER KEY ECU - BATTERY AND BODY GROUND) Disconnect the T13 ECU connector. (Scheme 106): Identifying T13 ECU Connector Measure the voltage and resistance of the wire harness side connector. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition T13-1 (CPUB) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T13-14 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
3. CHECK RESISTANCE OF COMMUNICATION LINE Disconnect the G3, T7 and T13 ECU connectors. (Scheme 107): Identifying G3, T7 And T13 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition T13-4 (MPX1) - T7-33 (MPX2) Below 1 ohms T13-5 (MPX2) - G3-4 (MPD1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE TRANSPONDER KEY ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE TRANSPONDER KEY ECU

This DTC is detected when communication between the multiplex network front light ECU and network gateway ECU stops for more than 10 seconds.

DTC DETECTION CONDITION CHART

Front Light ECU Communication - Wiring Diagram. Scheme 108

Scheme 109

Scheme 110

1. CHECK OPERATION (DIMMER SWITCH) Turn the dimmer switch ON and check that the headlights illuminate. OK: Headlights illuminate. OK: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU (Scheme 109): Identifying Multiplex Network Front Light ECU Connectors Terminal NG: Go to next step.
2. INSPECT FUSE (MPX-B3) Remove the MPX-B3 fuse from the passenger side junction block. Measure the resistance of the fuse. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to next step.
3. CHECK WIRE HARNESS (MULTIPLEX NETWORK FRONT LIGHT ECU - BATTERY AND BODY GROUND) Measure the voltage and resistance of the wire harness side connectors. NOTE: The inspection should be performed from the backside of the relay block with the multiplex network front light ECU connector connected. Standard voltage VOLTAGE SPECIFICATION Tester Connection Specified Condition Relay block front light ECU terminal 8 (FMB3) - Body ground 10 to 14 V Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Relay block front light ECU terminal 12 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to next step.
4. CHECK RESISTANCE OF COMMUNICATION LINE Remove the front light ECU from the engine room No. 2 relay block. Disconnect the A31 and G3 ECU connectors. (Scheme 110): Identifying Front Light ECU And A31 And G3 ECU Connectors Measure the resistance of the wire harness side connectors. Standard resistance RESISTANCE SPECIFICATION Tester Connection Specified Condition Relay block front light ECU terminal 5 (MPX1) - G3-17 (MPL2) Below 1 ohms Relay block front light ECU terminal 6 (MPX2) - A31-5 (MPX1) Below 1 ohms Result RESULT CHART Result Proceed to Both are OK A One is OK B Both are NG C B: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU AND REPAIR OR REPLACE HARNESS AND CONNECTOR C: REPAIR OR REPLACE HARNESS AND CONNECTOR A: REPLACE MULTIPLEX NETWORK FRONT LIGHT ECU