Toyota Tundra Service Manual: Lost Communication with Gateway Module (U1002)

Toyota Tundra Service Manual / Vehicle Interior / Pre-collision / Pre-collision System / Lost Communication with Gateway Module (U1002)

DESCRIPTION

DTC U1002 is stored when the millimeter wave radar sensor assembly cannot receive signals from the forward recognition camera.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U1002

Lost Communication with Gateway Module

After the ignition switch is turned to ON, communication between the millimeter wave radar sensor assembly and forward recognition camera is abnormal for 1 second or more.

  • CAN bus line or connector
  • Forward recognition camera
  • Millimeter wave radar sensor assembly
  • Millimeter wave radar wire

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • When replacing the forward recognition camera, always replace it with a new one. If a forward recognition camera which was installed to another vehicle is used, the information stored in the forward recognition camera will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the forward recognition camera has been replaced with a new one, be sure to perform forward recognition camera adjustment.

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  • When replacing the millimeter wave radar sensor assembly, always replace it with a new one. If a millimeter wave radar sensor assembly which was installed to another vehicle is used, the information stored in the millimeter wave radar sensor assembly will not match the information from the vehicle. As a result, a DTC may be stored.
  • If the millimeter wave radar sensor assembly has been replaced, be sure to perform millimeter wave radar sensor assembly adjustment.

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HINT:

  • Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
  • When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.

PROCEDURE

1.

CHECK CAN BUS LINE (MALFUNCTION CONFIRMATION)

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Result

d1-5 (CA1P) - d1-6 (CA1N)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

Below 54 Ω:

Short circuit between CAN bus lines

70 Ω or more:

Open circuit in a CAN bus line

d1-5 (CA1P) - d1-1 (SGND)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Below 200 Ω:

Ground short

d1-6 (CA1N) - d1-1 (SGND)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Below 200 Ω:

Ground short

d1-5 (CA1P) - d1-8 (IGB)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ:

+B short

d1-6 (CA1N) - d1-8 (IGB)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ:

+B short

*a

Component with harness connected

(Millimeter Wave Radar Sensor Assembly)

Result

Proceed to

OK

A

NG (Open circuit in CAN bus line)

B

NG (Short circuit between CAN bus lines)

C

NG (Short to +B or ground)

D

B

GO TO STEP 3

C

GO TO STEP 6

D

GO TO STEP 9

A

2.

CHECK FOR DTCs (PRE-COLLISION SYSTEM)

(a) Clear the DTCs.

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(b) Make sure that the DTC detection conditions are met.

HINT:

If the detection conditions are not met, the system cannot detect the malfunction.

(c) Check for DTCs.

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Result

Proceed to

DTC U1002 is not output

A

DTC U1002 is output

B

A

USE SIMULATION METHOD TO CHECK

B

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

3.

CHECK FOR OPEN IN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - FORWARD RECOGNITION CAMERA)

(a) Disconnect the W9 forward recognition camera connector.

(b) Disconnect the d1 millimeter wave radar sensor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-6 (CANH) - d1-5 (CA1P)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

W9-12 (CANL) - d1-6 (CA1N)

Cable disconnected from negative (-) battery terminal

Below 1 Ω

(d) Connect the d1 millimeter wave radar sensor assembly connector.

(e) Connect the W9 forward recognition camera connector.

NG

GO TO STEP 5

OK

4.

CHECK FOR OPEN IN CAN BUS LINES (FORWARD RECOGNITION CAMERA)

(a) Disconnect the W9 forward recognition camera connector.

*a

Front view of wire harness connector

(to Forward Recognition Camera)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-6 (CANH) - W9-12 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

(c) Connect the W9 forward recognition camera connector.

OK

REPLACE FORWARD RECOGNITION CAMERA

NG

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

5.

CHECK MILLIMETER WAVE RADAR WIRE

(a) Disconnect the d1 millimeter wave radar sensor assembly connector.

(b) Disconnect the Ad1 millimeter wave radar wire connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Ad1-5 - d1-5 (CA1P)

Always

Below 1 Ω

Ad1-6 - d1-6 (CA1N)

Always

Below 1 Ω

(d) Connect the d1 millimeter wave radar assembly connector.

(e) Connect the Ad1 millimeter wave radar sensor wire connector.

OK

REPAIR OR REPLACE CAN BUS LINE OR CONNECTOR (MILLIMETER WAVE RADAR SENSOR ASSEMBLY - FORWARD RECOGNITION CAMERA)

NG

REPAIR MILLIMETER WAVE RADAR WIRE

6.

CHECK FOR SHORT BETWEEN CAN BUS LINES (FORWARD RECOGNITION CAMERA)

(a) Disconnect the W9 forward recognition camera connector.

*a

Front view of wire harness connector

(to Forward Recognition Camera)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-6 (CANH) - W9-12 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

(c) Connect the W9 forward recognition camera connector.

OK

REPLACE FORWARD RECOGNITION CAMERA

NG

7.

CHECK FOR SHORT BETWEEN CAN BUS LINES (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

(a) Disconnect the d1 millimeter wave radar sensor assembly connector.

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

d1-5 (CA1P) - d1-6 (CA1N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

(c) Connect the d1 millimeter wave radar sensor assembly connector.

OK

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

NG

8.

CHECK MILLIMETER WAVE RADAR WIRE

(a) Disconnect the Ad1 millimeter wave radar wire connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Ad1-5 - Ad1-6

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

*a

Front view of wire harness connector

(to Millimeter Wave Radar Wire)

(c) Connect the Ad1 millimeter wave radar sensor wire connector.

OK

REPAIR MILLIMETER WAVE RADAR WIRE

NG

REPAIR OR REPLACE CAN BUS LINE OR CONNECTOR (MILLIMETER WAVE RADAR WIRE - FORWARD RECOGNITION CAMERA)

9.

CHECK FOR SHORT IN CAN BUS LINE (FORWARD RECOGNITION CAMERA)

(a) Disconnect the W9 forward recognition camera connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Forward Recognition Camera)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

W9-6 (CANH) - J17-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

W9-12 (CANL) - J17-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

W9-6 (CANH) - J17-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

W9-12 (CANL) - J17-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

(c) Connect the W9 forward recognition camera connector.

OK

REPLACE FORWARD RECOGNITION CAMERA

NG

10.

CHECK FOR SHORT IN CAN BUS LINE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

(a) Disconnect the d1 millimeter wave radar sensor assembly connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Millimeter Wave Radar Sensor Assembly)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

d1-5 (CA1P) - J17-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

d1-6 (CA1N) - J17-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

d1-5 (CA1P) - J17-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

d1-6 (CA1N) - J17-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

(c) Connect the d1 millimeter wave radar sensor assembly connector.

OK

REPLACE MILLIMETER WAVE RADAR SENSOR ASSEMBLY

NG

11.

CHECK FOR SHORT IN CAN BUS LINE (MILLIMETER WAVE RADAR SENSOR ASSEMBLY)

(a) Disconnect the Ad1 millimeter wave radar wire connector.

*1

DLC3

-

-

*a

Front view of wire harness connector

(to Millimeter Wave Radar Wire)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Ad1-5 - J17-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Ad1-6 - J17-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Ad1-5 - J17-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Ad1-6 - J17-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

(c) Connect the Ad1 millimeter wave radar wire connector.

OK

REPAIR MILLIMETER WAVE RADAR WIRE

NG

REPAIR OR REPLACE CAN BUS LINE OR CONNECTOR (MILLIMETER WAVE RADAR WIRE - FORWARD RECOGNITION CAMERA)

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