NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 J
Service Category: Power Source/Network	Section: Networking
Model Year: 2008	Model: Sequoia	Doc ID: RM000003F08000X
Title: NETWORKING: CAN COMMUNICATION SYSTEM: DESCRIPTION (2008 Sequoia)

Suspension Control ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Suspension Control ECU Communication Stop Mode	When either condition below is met: Air suspension is not displayed on "CAN Bus Check". Applies to "Suspension Control ECU Communication Stop Mode" in "DTC Combination Table".	Power source or inside suspension control ECU Suspension control ECU branch wire or connector Suspension control ECU

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.

2.	CHECK FOR OPEN IN CAN BUS WIRE (SUSPENSION CONTROL ECU BRANCH WIRE)

(a) w/ AVS

(1) Disconnect the O18 suspension control ECU connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
O18-30 (CANH) - O18-29 (CANL)	Ignition switch off	54 to 69 Ω

(b) w/o AVS

(1) Disconnect the O19 suspension control ECU connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
O19-29 (CANH) - O19-28 (CANL)	Ignition switch off	54 to 69 Ω

3.	CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - BATTERY AND BODY GROUND)

(a) w/ AVS

(1) Reconnect the cable to the negative (-) battery terminal.

(2) Disconnect the O17 and O18 suspension control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O17-5 (GND) - Body ground	Always	Below 1 Ω
O18-1 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
O17-6 (B) - Body ground	Always	11 to 14 V
O18-10 (IG) - Body ground	Ignition switch ON	11 to 14 V

(b) w/o AVS

(1) Reconnect the cable to the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

(2) Disconnect the O19 suspension control ECU connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
O19-22 (GND) - Body ground	Always	Below 1 Ω

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
O19-24 (B) - Body ground	Always	11 to 14 V
O19-10 (IG) - Body ground	Ignition switch ON	11 to 14 V