Lexus DTC B2796 Manuale utente

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Page 1 of 3

Title:

TROUBLESHOOTING IMMOBILIZER

DTC B2796

Models:

’98 & ’99 All Models

TechnicalService

InformationBulletin

March 12, 1999

EL003–99

The Diagnostic Section (DI) of the Repair Manual has been expanded and clarified to

assist in troubleshooting the Engine Immobilizer System. Use this information in

accordance with the current Repair Manual for each model to diagnose the system.

S1998 and 1999 All Models

DTC B2796 No Communication In

Immobilizer System

CIRCUIT DESCRIPTION

This DTC is stored in memory when a key that does not have a Transponder Chip is

inserted into the ignition or if there is loss of communication between the key and ECM.

DTC No. Condition Probable Cause

B2796 SNo Communication

SKey

STransponder key coil

STransponder key amplifier

SWire harness

SECM

OP CODE DESCRIPTION TIME OPN T1 T2

N/A Not Applicable to Warranty – – – –

ELECTRICAL

Introduction

Affected

Vehicles

Diagnostic

Procedure

Warranty

Information

TROUBLESHOOTING IMMOBLIZER DTC B2796 – EL003-99 March 12, 1999

Page 2 of 3

Delete the DTC and insert all presently available keys to check

whether the engine starts or not.

RESULT:

(A) All keys start the engine.

(B) A specific key does not start the

engine. DTC (B2796) is stored in

memory.

DTC (B2796) is stored in memory.

NOTE:

If the result is “A”, seek additional

information from the customer to see if

he/she ever inserted a key without a

Transponder Chip into the ignition.

No Problem.

Replace the Transponder Key Coil.

The Transponder Chip of a specific

key is defective. Replace the key.

Check the Transponder Key Coil. Refer to the Transponder Key

Coil Inspection Procedure in the Repair Manual.

Diagnostic

Procedure

TROUBLESHOOTING IMMOBLIZER DTC B2796 – EL003-99 March 12, 1999

Page 3 of 3

Check the harness and connector between the Transponder Key

Amplifier and ECM.

Repair or replace the damaged

harness and/or connector.

Replace the Transponder Key

Amplifier.

Exchange the Transponder Key Amplifier with a known good one.

Does the system operate normally?

Replace the ECM.

YES

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