Toyota 4Runner manuals

Toyota 4Runner: System Description

SYSTEM DESCRIPTION

1. LIN COMMUNICATION SYSTEM DESCRIPTION

The LIN communication system is used for communication between the components in the tables below. If communication cannot be performed through LIN communication because of a break in the communication lines or some other reason, the master control ECU of the relevant system stores DTCs. Refer to the table below about the communication bus lines and connected components.

HINT:

  • Each component has a fail-safe function which activates to maintain the minimum performance of the system and protect the system.
  • In the following table, "○" indicates that the function applies, and "-" indicates that it does not.
Door Bus Lines

Component

Master Control

LIN Communication DTC Output Function

Main body ECU (multiplex network body ECU)

Multiplex network master switch assembly

-

-

Front power window regulator motor assembly LH

-

-

Front power window regulator motor assembly RH

-

-

Rear power window regulator motor assembly LH

-

-

Rear power window regulator motor assembly RH

-

-

Sliding roof ECU (sliding roof drive gear sub-assembly)*

-

-

Multiplex network door ECU (back door P/W)

-

-

  • *: w/ Sliding Roof System
Certification Bus Lines (w/ Smart Key System)

Component

Master Control

LIN Communication DTC Output Function

Certification ECU (smart key ECU assembly)

Power management control ECU

-

Steering lock ECU (steering lock actuator assembly)

-

-

ID code box (immobilizer code ECU)

-

-

Air Conditioning Bus Lines

Component

Master Control

LIN Communication DTC Output Function

Air conditioning amplifier assembly

-

Heater control assembly

-

-

Sub-LIN Bus Lines

Component

Master Control

LIN Communication DTC Output Function

Multiplex network door ECU (back door P/W)

Back door power window regulator sub-assembly

-

-

Drive Monitor Switch Bus Lines (w/ CRAWL Control)

Component

Master Control

LIN Communication DTC Output Function

Drive monitor switch

Combination meter assembly

-

-

System Diagram
SYSTEM DIAGRAM 1. DOOR BUS LINES 2. CERTIFICATION BUS LINES (w/ Smart Key System) 3. AIR CONDITIONING BUS LINES 4. SUB-LIN BUS LINES 5. DRIVE MONITOR SWITCH BUS LINES (w/ CRAWL Control) ...

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the LIN communication system. *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGHT TO ...

Other materials about Toyota 4Runner:

Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. REMOVE REAR WHEEL 2. DRAIN BRAKE FLUID NOTICE: Wash the brake fluid off immediately if i ...

Control Module Communication Bus OFF (U0073,U0100,U0114,U0123,U0124,U0126)
DESCRIPTION DTC Code DTC Detection Conditions Trouble Area U0073 One of the following conditions is met: When the IG1 terminal voltage is between 10 and 17.4 V, after the output ...

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