Lexus ES manuals

Lexus ES: Tire Pressure Monitor Receiver Communication Stop (B1247)

DESCRIPTION

The main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver communicate by direct line. If a malfunction occurs in this communication signal, B1247 is output by the main body ECU (multiplex network body ECU).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Note

B1247

Tire Pressure Monitor Receiver Communication Stop

Communication between the tire pressure warning ECU and receiver and main body ECU (multiplex network body ECU) is interrupted for 10 seconds or more.

  • Tire pressure warning ECU and receiver
  • Wire harness or connector
  • Main body ECU (Multiplex network body ECU)

This DTC is for main body ECU (multiplex network body ECU)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
  • It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver after the ECU has been replaced.
  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

PROCEDURE

1.

INSPECT TIRE PRESSURE WARNING ECU AND RECEIVER (OUTPUT WAVEFORM)

(a) Using an oscilloscope, check the waveform.

NOTICE:

With the connector connected, check from the backside of the connector.

OK:

Tester Connection

Tool Setting Range

Condition

Specified Condition

N8-4 (RDA) - Body ground

5 V/DIV.5 ms./DIV.

Engine switch on (IG)

Waveform generation

*a

Component with harness connected

(Tire Pressure Warning ECU and Receiver)

*b

GND

Result

Proceed to

Waveform is as shown in the illustration. (Waveform alternates between 10.5 V or higher and 0.5 V or less)

A

Waveform does not change from 10.5 V or higher

B

Waveform does not change from 0.5 V or less

C

A

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

B

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

C

2.

CHECK TERMINAL VOLTAGE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) OUTPUT)

(a) Disconnect the N8 tire pressure warning ECU and receiver connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

N8-4 (RDA) - Body ground

Engine switch on (IG)

10.5 V or higher

OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

3.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - TIRE PRESSURE WARNING ECU AND RECEIVER)

(a) Turn the engine switch off.

(b) Disconnect the G38 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

G38-10 (RDA) - N8-4 (RDA)

Always

Below 1 Ω

G38-10 (RDA) or N8-4 (RDA) - Body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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