Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJEK
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: NETWORKING: CAN COMMUNICATION SYSTEM: U1002; Lost Communication with Gateway Module (Power Management2); 2016 MY Sienna [12/2015 - 08/2016]

DTC

U1002

Lost Communication with Gateway Module (Power Management2)

DESCRIPTION

DTC Code

Symptom

Trouble Area

U1002

Lost Communication with Gateway Module (Power Management2).

  • Power management bus circuit
  • ECM main wire or connector
  • Power management control ECU main wire or connector
  • Air conditioning amplifier assembly branch wire or connector
  • ECM
  • Power management control ECU
  • Air conditioning amplifier assembly
  • No. 3 junction connector

HINT:

For vehicle with smart key system only.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Turn the ignition switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.
  • Turn the ignition switch off before inspecting CAN bus wires for a ground short.
  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

PRECAUTION

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (See page 2016 MY Sienna [12/2015 - 08/2016]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION ).

NEXT

2.

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page 2016 MY Sienna [12/2015 - 08/2016]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION ).

NEXT

3.

CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, BUS LINE FOR SHORT CIRCUIT)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

Resistance Malfunction

D181-3 (CANP) - D181-14 (CANN)

Ignition switch off

54 to 69 Ω

Below 53 Ω: Short in line

Ignition switch off

70 Ω or higher: Open in CAN main bus line

D181-3 (CANP) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Below 6 kΩ: +B short

D181-14 (CANN) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Below 6 kΩ: +B short

D181-3 (CANP) - D16-4 (CG)

Ignition switch off

200 Ω or higher

Below 200 Ω: Ground short

D181-14 (CANN) - D16-4 (CG)

Ignition switch off

200 Ω or higher

Below 200 Ω: Ground short

Text in Illustration

*a

Junction connector with harness connected

(No. 3 Junction Connector)

*b

Front view of DLC3

Result

Result

Proceed to

NG

- Open in CAN main wire

A

NG

- Short in line

- +B short

- Ground short

B

OK

C

B

GO TO STEP 10

C

GO TO STEP 19

A

4.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)

(a) Disconnect the No. 3 junction connector connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D181-3 (CANP) - D181-14 (CANN)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

NG

GO TO STEP 6

OK

5.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the No. 3 junction connector connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D181-2 (CANH) - D181-13 (CANL)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

OK

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

NG

GO TO STEP 8

6.

CONNECT CONNECTOR

(a) Reconnect the D181 No. 3 junction connector.

NEXT

7.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - ECM)

(a) Disconnect the ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A39-8 (CANP) - A39-9 (CANN)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Front view of wire harness connector

(to ECM)

OK

REPLACE ECM

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - ECM)

8.

CONNECT CONNECTOR

(a) Reconnect the D181 No. 3 junction connector.

NEXT

9.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the power management control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D89-12 (CA3P) - D89-11 (CA3N)

Ignition switch off

108 to 132 Ω

Text in Illustration

*a

Front view of wire harness connector

(to Power Management Control ECU)

OK

REPLACE POWER MANAGEMENT CONTROL ECU

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

10.

CHECK FOR SHORT IN CAN BUS MAIN WIRES (NO. 3 JUNCTION CONNECTOR - ECM)

(a) Disconnect the No. 3 junction connector connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D181-3 (CANH) - D181-14 (CANL)

Ignition switch off

108 to 132 Ω

D181-3 (CANH) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D181-14 (CANL) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D181-3 (CANH) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

D181-14 (CANL) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

*b

Front view of DLC3

NG

GO TO STEP 13

OK

11.

CHECK FOR SHORT IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the No. 3 junction connector connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D181-2 (CANH) - D181-13 (CANL)

Ignition switch off

108 to 132 Ω

D181-2 (CANH) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D181-13 (CANL) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D181-2 (CANH) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

D181-13 (CANL) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

*b

Front view of DLC3

NG

GO TO STEP 15

OK

12.

CHECK FOR SHORT IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the No. 3 junction connector connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D181-1 (CANH) - D181-12 (CANL)

Ignition switch off

200 Ω or higher

D181-1 (CANH) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D181-12 (CANL) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D181-1 (CANH) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

D181-12 (CANL) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Rear view of wire harness connector

(to No. 3 Junction Connector)

*b

Front view of DLC3

OK

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

NG

GO TO STEP 17

13.

CONNECT CONNECTOR

(a) Reconnect the D181 No. 3 junction connector.

NEXT

14.

CHECK FOR SHORT IN CAN BUS MAIN WIRE (ECM)

(a) Disconnect the ECM connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

A39-8 (CANP) - A39-9 (CANN)

Ignition switch off

108 to 132 Ω

A39-8 (CANP) - D16-4 (CG)

Ignition switch off

200 Ω or higher

A39-9 (CANN) - D16-4 (CG)

Ignition switch off

200 Ω or higher

A39-8 (CANP) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

A39-9 (CANN) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to ECM)

*b

Front view of DLC3

OK

REPLACE ECM

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - ECM)

15.

CONNECT CONNECTOR

(a) Reconnect the D181 No. 3 CAN junction connector.

NEXT

16.

CHECK FOR SHORT IN CAN BUS MAIN WIRE (POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the power management control ECU connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D89-12 (CA3P) - D89-11 (CA3N)

Ignition switch off

108 to 132 Ω

D89-12 (CA3P) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D89-11 (CA3N) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D89-12 (CA3P) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

D89-11 (CA3N) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to Power Management Control ECU)

*b

Front view of DLC3

OK

REPLACE POWER MANAGEMENT CONTROL ECU

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

17.

CONNECT CONNECTOR

(a) Reconnect the D181 No. 3 junction connector.

NEXT

18.

CHECK FOR SHORT IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the air conditioning amplifier assembly.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

D75-11 (CANH) - D75-12 (CANL)

Ignition switch off

108 to 132 Ω

D75-11 (CANH) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D75-12 (CANL) - D16-4 (CG)

Ignition switch off

200 Ω or higher

D75-11 (CANH) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

D75-12 (CANL) - D16-16 (BAT)

Ignition switch off

6 kΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to Air Conditioning Amplifier Assembly)

*b

Front view of DLC3

OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

NG

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)

19.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - POWER SOURCE)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page 2016 MY Sienna [12/2015 - 08/2016]; INTRODUCTION: REPAIR INSTRUCTION: INITIALIZATION ).

(b) Disconnect the power management control ECU.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

D89-6 (GND) - Body ground

Always

Below 1 Ω

D89-5 (GND2) - Body ground

Always

Below 1 Ω

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

D89-2 (AM21) - Body ground

Always

11 to 14 V

D89-1 (AM22) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Power Management Control ECU)

OK

REPLACE POWER MANAGEMENT CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR