Toyota Tundra Service Manual: Lost Communication with HMI-LAN (B150A)

DESCRIPTION

  • *1: w/ Navigation System
  • *2: w/o Navigation System

The combination meter assembly receives text data signals from the navigation receiver assembly*1 or radio and display receiver assembly*2 via local bus communication.

Based on these signals, navigation system*1 or audio and visual system*2 information is displayed on the multi-information display.

This DTC is stored when the combination meter assembly cannot receive the signal.

DTC Code

DTC Detection Condition

Trouble Area

B150A

After the combination meter assembly receives a registration information signal, which is sent by the navigation receiver assembly*1 or radio and display receiver assembly*2 when the ignition switch is to ACC, 1 or more times, the combination meter assembly cannot receive the signal for 30 seconds or more.

  • Harness or connector
  • Navigation receiver assembly*1
  • Radio and display receiver assembly*2
  • Combination meter assembly

WIRING DIAGRAM

w/ Navigation System: w/o Navigation System:

CAUTION / NOTICE / HINT

HINT:

DTC B150A may be stored if the battery voltage dropped.

PROCEDURE

1.

CHECK COMBINATION METER ASSEMBLY

(a) w/ Navigation System:

(1) Check if navigation system DTCs are output.

Click here

OK:

Navigation system DTCs are not output.

(b) w/o Navigation System:

(1) Check if audio and visual system DTCs are output.

Click here

OK:

Audio and visual system DTCs are not output.

Result

Proceed to

OK

A

NG (w/ Navigation System)

B

NG (w/o Navigation System)

C

B

GO TO NAVIGATION SYSTEM

C

GO TO AUDIO AND VISUAL SYSTEM

A

2.

CHECK HARNESS AND CONNECTOR (LOCAL BUS COMMUNICATION LINE CIRCUIT)

(a) w/ Navigation System:

(1) Disconnect the J136 navigation receiver assembly connector.

(2) Disconnect the J28 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J136-3 (CNH1) - J28-18 (MSCH)

Always

Below 1 Ω

J136-4 (CNL1) - J28-19 (MSCL)

Always

Below 1 Ω

J136-3 (CNH1) - Body ground

Always

10 kΩ or higher

J136-4 (CNL1) - Body ground

Always

10 kΩ or higher

J136-3 (CNH1) - J136-4 (CNL1)

Always

10 kΩ or higher

(b) w/o Navigation System:

(1) Disconnect the J140 radio and display receiver assembly connector.

(2) Disconnect the J28 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

J140-3 (CNH1) - J28-18 (MSCH)

Always

Below 1 Ω

J140-4 (CNL1) - J28-19 (MSCL)

Always

Below 1 Ω

J140-3 (CNH1) - Body ground

Always

10 kΩ or higher

J140-4 (CNL1) - Body ground

Always

10 kΩ or higher

J140-3 (CNH1) - J140-4 (CNL1)

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

CHECK COMBINATION METER ASSEMBLY

(a) Replace the combination meter assembly with a new one.

Click here

(b) Turn the ignition switch to ON and wait 30 seconds.

NOTICE:

A maximum of 30 seconds is required to send/receive the registration information between the combination meter assembly and navigation receiver assembly*! or radio and display receiver assembly*2.

  • *1: w/ Navigation System
  • *2: w/o Navigation System

(c) Operate the steering pad switch assembly and check that the audio tab illuminates.

(d) Check for DTCs.

Click here

OK:

The audio tab illuminates and DTC B150A is not output.

Result

Proceed to

OK

A

NG (w/ Navigation System)

B

NG (w/o Navigation System)

C

A

END

B

REPLACE NAVIGATION RECEIVER ASSEMBLY

C

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    Meter / Gauge System

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