RX400h · Service Manual SECURITIES

B2797 Keys are positioned too close to each other, or noise occurs in communication line.

Diagnostic trouble codes

DESCRIPTION

This DTC is output when an error occurs in normal communication.

HINT:
Some noise will be found in the communication line.

DTC No.
 DTC Detection Condition
 Trouble Area
B2797
 Keys are positioned too close to each other, or noise occurs in communication line.
  1. Key
  2. Transponder key amplifier
  3. Wire harness
  4. Transponder key ECU assembly

WIRING DIAGRAM

B052550E07

INSPECTION PROCEDURE


1. CHECK KEY

  1. B111583E01
    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



B
Go to step 3
A


2. CHECK FOR DTC

  1. Delete the DTC (Click here).

  1. Insert the key into the ignition key cylinder.

  1. Check that no code is output.

    OK:
    No DTC is output.



 OK
NO PROBLEM
NG


3. CHECK TRANSPONDER KEY AMPLIFIER

  1. B111615E05
    Using an oscilloscope or the intelligent tester, check the waveform between the terminals of the T7 amplifier and T8 ECU connector. Check that no noise is included in the waveform (an example of noise is shown on the left).

  1. Check that no noise is included in the waveform (an example of noise is shown on the left).

    OK:
    Tester Connection
    		 Specified Condition
    T7-4 (CODE) - T8-10 (CODE)
    		 No noise is present

    Tool Setting
    		 2 V/DIV., 20 ms/DIV.
    Condition
    		 Key inserted into ignition key cylinder.



NG
FIND CAUSE OF NOISE AND REMOVE NOISE
OK


4. CHECK HARNESS AND CONNECTOR (TRANSPONDER KEY ECU - TRANSPONDER KEY AMPLIFIER)

  1. B111591E04
    Disconnect the T8 ECU and T7 amplifier connectors.

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

    Resistance:
    Tester Connection
    		 Specified Condition
    T8-10 (CODE) - T7-4 (CODE)
    		 Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5. CHECK OPERATION OF TRANSPONDER KEY AMPLIFIER

  1. After replacing the transponder key amplifier with a normally functioning transponder key amplifier, check that the hybrid control system starts.

    OK:
    Hybrid control system starts.



 NG
REPLACE TRANSPONDER KEY ECU ASSEMBLY
OK

END (TRANSPONDER KEY AMPLIFIER DEFECTIVE)


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