THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DESCRIPTION (2008 Sequoia)

Last Modified: 11-29-2007		1.6 C
Service Category: Vehicle Interior	Section: Theft Deterrent/Keyless Entry
Model Year: 2008	Model: Sequoia	Doc ID: RM000001TCH009X
Title: THEFT DETERRENT / KEYLESS ENTRY: ENGINE IMMOBILISER SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

B2797

Communication Malfunction No. 1

DTC

B2798

Communication Malfunction No. 2

DESCRIPTION

This DTC is output when a communication error occurs between the transponder key amplifier and transponder key ECU. Some possible reasons for the communication error are: 1) 2 or more ignition keys are positioned too close together, or 2) noise is occurring in the communication line.

DTC Code

DTC Detection Condition

Trouble Area

B2797

B2798

A communication error occurs for about 20 seconds after insertion of a key.

Key
Harness or connector
Transponder key amplifier
Transponder key ECU

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

When the transponder key ECU is replaced, reregister the ECU - ECM communication ID .

PROCEDURE

CHECK KEY

(a) Check whether the ignition key being used is near other ignition keys, as shown in the illustration. Also, check whether the key ring is in contact with the key grip.

Result

Result	Proceed to
Key is near other keys and/or key ring is in contact with key grip	A
Key is not near other keys and/or key ring is not in contact with key grip	B

CLEAR DTC

(a) Separate the keys from each other, or remove the key ring.

(b) Clear the DTC .

3.	CHECK FOR DTC

(a) Check that no DTC is output .

OK:

DTC is not output.

4.	REPLACE TRANSPONDER KEY AMPLIFIER

(a) Temporarily replace the transponder key amplifier with a new or normally functioning one .

CLEAR DTC

(a) Clear the DTC .

CHECK DTC

(a) Check for DTC is output .

OK:

DTC is not output.