Multiplex Communication: Overview Toyota Sienna II рестайлинг

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1. MULTIPLEX COMMUNICATION SYSTEM (BEAN) The BEAN communication line is used to control the combination meter, the A/C amplifier, the airbag sensor assembly, the multiplex network body ECU, the power slide door ECU LH, the power slide door ECU RH, the power back door ECU, the seat position control ECU, the outer mirror control ECU LH, and the outer mirror ECU RH. If there is a short-circuit (bus-down) in the line, the communication to the system that has a short-circuit (bus-down) will be disabled and the DTC concerning the system will be output from the multiplex network gateway ECU. if the DTC of ECU communication stop is output, connectors may be disconnected, or communication buses may be open at 2 points. It will not become abnormal with only 1 communication bus open. If 2 communication buses are open at the points shown in the illustration, the DTC of ECU communication stop between those 2 buses is output.
2. CHECK COMMUNICATION FUNCTION Check the battery voltage. Standard voltage: 11 to 14 V Inspect the DTC output. Check a DTC concerning the multiplex network body ECU by connecting the intelligent tester to the DLC3 and turning the ignition switch to the ON position. When the display shows DTCs concerning the ECU unconnected and the communication bus defective, perform the inspection depending on the troubleshooting procedures. HINT: When another DTC is output, refer to the DTC table and check the applicable instruction.

DESCRIPTION

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

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - BATTERY) Disconnect the 1A and 1C junction block connectors. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition 1A-1 - Body ground Always 11 to 14 V 1C-24 (BECU) - Body ground Always 11 to 14 V 1C-30 (ALTB)-Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (MULTIPLEX NETWORK BODY ECU - GROUND) Disconnect the 1K and 1L junction connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition 1K-17 (GND2) - Body ground Always Below 1 ohms 1L-16 (GND1) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the A21, G4 and B7 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition 1E-7 (MPX1) - A21-22 (MPX2) Always Below 1 ohms B7-21 (MPX2) - G4-3 (MPD1), G4-12 (MPD2) Always Below 1 ohms Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND MULTIPLEX NETWORK BODY ECU C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE MULTIPLEX NETWORK BODY ECU

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

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU RH - BATTERY) Disconnect the O11 ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Connection Specified Connection O11-3 (SIG) - Body ground Ignition switch: ON 11 to 14 V O11-4 (CPUB) - Body ground Always 11 to 14 V O11-6 (BDR) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU RH - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Connection Specified Connection O11-1 (GND)-Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the G4 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Connection Specified Connection O11-8 (MPX1) - G4-3 (MPD1) Always Below 1 ohms O11-8 (MPX1) - G4-12 (MPD2) Always Below 1 ohms Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are N6 C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND OUTER MIRROR CONTROL ECU RH C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE OUTER MIRROR CONTROL ECU RH

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

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU LH - BATTERY) Disconnect the O9 ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Connection Specified Connection O9-3 (SIG)-Body ground Ignition switch: ON 11 to 14 V O9-4 (CPUB) - Body ground Always 11 to 14 V O9-6 (BDR) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU LH - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Connection Specified Connection O9-1 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the G4 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Connection Specified Connection O9-8 (MPX1) - G4-3 (MPD1) Always Below 1 ohms O9-8 (MPX1) - G4-12 (MPD2) Always Below 1 ohms Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND OUTER MIRROR CONTROL ECU LH C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE OUTER MIRROR CONTROL ECU LH

DTCs B1214 and B1215 are output when a short to +B or the body ground occurs on the communication bus. Detecting this condition disables all the BEAN communication and outputs some DTCs.

DIAGNOSTIC TROUBLE CODE CHART

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DTC B1216 is output when communication between the power slide door ECU RH and the multiplex network gateway ECU stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (POWER SLIDE DOOR ECU RH - BATTERY) Disconnect the P28 and P27 ECU connectors. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P27-10 (ECUB) - Body ground Always 11 to 14 V P28-2 (B) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (POWER SLIDE DOOR ECU RH - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P28-8 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the G4 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P27-22 (MPX1) - G4-3 (MPD1) Always Below 1 ohms P27-22 (MPX1) - G4-12 (MPD2) Always Below 1 ohms Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND POWER SLIDE DOOR ECU RH C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE POWER SLIDE DOOR ECU RH

DTC B1217 is output when communication between the power slide door ECU LH and the multiplex network gateway ECU stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (POWER SLIDE DOOR ECU LH - BATTERY) Disconnect the P25 and P26 ECU connectors. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P25-10 (ECUB) - Body ground Always 11 to 14 V P26-2 (B) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (POWER SLIDE DOOR ECU LH - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P26-8 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the G4 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P25-22 (MPX1) - G4-3 (MPD1) Always Below 1 ohms P25-22 (MPX1) - G4-12 (MPD2) Always Below 1 ohms Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND POWER SLIDE DOOR ECU LH C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE POWER SLIDE DOOR ECU LH

DTC B1262 is output when communication between the A/C amplifier and the multiplex network gateway ECU stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - BATTERY) Disconnect the A9 connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-18 (IG) (*1), (IG+) (*2) - Body ground Ignition switch: ON 11 to 14V A9-19 (ACC) (*1), A9-40 (ACC) (*2) - Body ground Ignition switch: ACC 11 to 14 V A9-20 (B) (*1), A9-17 (+B) (*2) - Body ground Always 11 to 14 V HINT: *1: for Automatic A/C *2: for Manual A/C NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-1 (GND) (*1), A9-6 (GND) (*2) - Body ground Always Below 1 ohms HINT: *1: for Automatic A/C *2: for Manual A/C NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the C10 and A21 connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A9-3 (MPX-) (*1), A9-5 (MPX-) (*2) - A21-24 (MPX1) Always Below 1 ohms A9-2 (MPX+) (*1), A9-4 (MPX+) (*2) - C10-28 Always Below 1 ohms HINT: *1: for Automatic A/C *2: for Manual A/C Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND A/C AMPLIFIER C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE A/C AMPLIFIER

DTC B1271 is output when communication between the combination meter and the multiplex network gateway ECU stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (COMBINATION METER - BATTERY) Disconnect the C10 connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition C10-32 - Body ground Ignition switch: ON 11 to 14 V C10-12 - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition C10-30 - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the A9 and G4 connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition C10-29 - G4-3 (MPD1), G4-12 (MPD2) Always Below 1 ohms C10-28 - A9-2 (MPX+) (*1), A9-4 (MPX+) (*2) Always Below 1 ohms HINT: *1: for Automatic A/C *2: for Manual A/C Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND COMBINATION METER C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE COMBINATION METER

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

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (SEAT POSITION CONTROL ECU - BATTERY) Disconnect the P58 and P59 ECU connectors. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P59-4 (IG) - Body ground Ignition switch: ON 11 to 14 V P59-8 (SYSB) - Body ground Always 11 to 14 V P58-5 (+B) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (SEAT POSITION CONTROL ECU - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P58-1 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the G4 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P59-1 (MPX1) - G4-3 (MPD1) Always Below 1 ohms P59-1 (MPX1) - G4-12 (MPD2) Always Below 1 ohms Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND SEAT POSITION CONTROL ECU C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE SEAT POSITION CONTROL ECU

DTC B1281 is output when communication between the airbag ECU and the multiplex network gateway ECU stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - BATTERY) Disconnect the A21 ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A21-5 (IG2) - Body ground Ignition switch: ON 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (AIRBAG SENSOR ASSEMBLY - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A21-27 (E1) - Body ground Always Below 1 ohms A21-28 (E2) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the 1E and A9 ECU connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition A21-22 (MPX2) - 1E-7 Always Below 1 ohms A21-24 (MPX1) - A9-3 (MPX-) (*1), A9-5 (MPX-) (*2) Always Below 1 ohms HINT: *1: for Automatic A/C *2: for Manual A/C Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND AIRBAG SENSOR ASSEMBLY C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE AIRBAG SENSOR ASSEMBLY

DTC B1287 is output when communication between the power back door ECU and the multiplex network gateway ECU stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE CHART

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1. CHECK HARNESS AND CONNECTOR (POWER BACK DOOR ECU - BATTERY) Disconnect the P14 and P13 ECU connectors. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P13-9 (IG) - Body ground Ignition switch: ON 11 to 14 V P13-10 (ECUB) - Body ground Always 11 to 14 V P14-2 (B) - Body ground Always 11 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
2. CHECK HARNESS AND CONNECTOR (POWER BACK DOOR ECU - GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P14-8 (GND) - Body ground Always Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step.
3. CHECK COMMUNICATION LINE Disconnect the G4 ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Condition Specified Condition P13-22 (MPX1) - G4-3 (MPD1) Always Below 1 ohms P13-22 (MPX1) - G4-12 (MPD2) Always Below 1 ohms Result RESULT REFERENCE Result Proceed to Both are OK A One is OK B Both are NG C B: REPAIR OR REPLACE HARNESS OR CONNECTOR AND POWER BACK DOOR ECU C: REPAIR OR REPLACE HARNESS OR CONNECTOR A: REPLACE POWER BACK DOOR ECU