Operation CHARM: Car repair manuals for everyone.
Home >> Lexus >> 2010 >> IS 250C V6-2.5L (4GR-FSE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Pinout Values and Diagnostic Parameters >> LIN Communication System
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

LIN Communication System





NETWORKING: LIN COMMUNICATION SYSTEM: TERMINALS OF ECU

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the P33 ECU connector.





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

HINT
Measure the values on the wire harness side with the connector disconnected.





(b) If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the P33 ECU connector.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.





(d) If the result is not as specified, the certification ECU (smart key ECU assembly) may be malfunctioning.

2. CHECK POWER SOURCE CONTROL ECU

(a) Disconnect the J55 ECU connector.





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

HINT
Measure the values on the wire harness side with the connector disconnected.





(b) If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the J55 ECU connector.

(d) Check for pulses according to the value(s) in the table below.





(d) If the result is not as specified, the power source control ECU may be malfunctioning.

3. CHECK ID CODE BOX (IMMOBILIZER CODE ECU)

(a) Disconnect the J69 ECU connector.





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

HINT
Measure the values on the wire harness side with the connector disconnected.





(b) If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the J69 ECU connector.

(d) Check for pulses according to the value(s) in the table below.





(d) If the result is not as specified, the ID code box (immobilizer code ECU) may be malfunctioning.

4. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

(a) Disconnect the J29 ECU connector.





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

HINT
Measure the values on the wire harness side with the connector disconnected.





(b) If the result is not as specified, there may be a malfunction in the wire harness.

(c) Reconnect the J29 ECU connector.

(d) Check for pulses according to the value(s) in the table below.





(d) If the result is not as specified, the steering lock ECU (steering lock actuator assembly) may be malfunctioning.
pro multis · About Operation CHARM