Toyota Venza: No Communication in Immobiliser System (B2796,B2798)

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/o Smart Key System) / No Communication in Immobiliser System (B2796,B2798)

DESCRIPTION

These DTCs are stored if a key that does not have a transponder chip is inserted into the ignition key cylinder or if communication between the key and the transponder key ECU assembly is impossible.

DTC No.	DTC Detection Condition	Trouble Area
B2796	The key code cannot be transmitted.	Key Transponder key amplifier Transponder key ECU assembly
B2798	Key code identification cannot be completed within the specified time (0.15 to 0.5 sec.).	Key Transponder key amplifier Transponder key ECU assembly

CAUTION / NOTICE / HINT

NOTICE:

If the transponder key ECU assembly is replaced, register the key and ECU communication ID (See page ).
If the key is replaced, register the key (See page ).

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Immobiliser / Data List.

(e) Read the Data List according to the display on the Techstream.

Immobiliser (Transponder Key ECU Assembly)

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Immobiliser	Immobiliser system status/SET or UNSET	UNSET: Ignition switch ON SET: Without key	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Immobiliser

Immobiliser system status/SET or UNSET

UNSET: Ignition switch ON

SET: Without key

OK:

On the Techstream screen, the item changes between UNSET and SET according to the chart above.

REPLACE TRANSPONDER KEY ECU ASSEMBLY

CHECK KEY

(a) Insert the vehicle's other key into the ignition key cylinder.

(b) Check that the engine starts with this key.

OK:

The engine starts.

GO TO STEP 5

3.	RE-REGISTER KEY

(a) Re-register the original key (See page
).

4.	CHECK ENGINE START

(a) Check that the engine starts.

OK:

The engine starts.

END (KEY WAS NOT REGISTERED CORRECTLY)

REPLACE KEY

5.	REPLACE TRANSPONDER KEY AMPLIFIER

(a) Replace the transponder key amplifier (See page ).

6.	CHECK ENGINE START

(a) Check that the engine starts.

OK:

The engine starts.

END (TRANSPONDER KEY AMPLIFIER WAS DEFECTIVE)

REPLACE TRANSPONDER KEY ECU ASSEMBLY

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is stored during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to "See page" below. ...

Theft Deterrent System Presence Detection (B279C)

DESCRIPTION If an ECM that is incompatible with the engine immobiliser system is installed, the ECM stores this DTC. DTC No. DTC Detection Condition Trouble Area ...

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