Last Modified: 11-29-2007 1.6 J
Service Category: Power Source/Network Section: Networking
Model Year: 2008 Model: Sequoia Doc ID: RM000002WSZ002X
Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 Sequoia)

Bus Buffer ECU Communication Stop Mode

DESCRIPTION

Detection Item

Symptom

Trouble Area

Bus Buffer ECU Communication Stop Mode

When either condition below is met:

  • Accessory Gateway is not displayed on "CAN Bus Check".
  • Applies to "Bus Buffer ECU Communication Stop Mode" in "DTC Combination Table".
  • Bus buffer ECU branch wire or connector
  • Bus buffer ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

1.

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.

NEXT

2.

CHECK FOR OPEN IN CAN BUS WIRE (BUS BUFFER ECU BRANCH WIRE)

(a) Disconnect the H66 bus buffer ECU connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

H66-3 (CAN+) - H66-2 (CAN-)

Ignition switch off

54 to 69 Ω
OK