CAN Communication System

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1113: Lost Communication with Steering Pad ECU
U1113 - Lost Communication with Steering Pad ECU

DESCRIPTION





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.

NOTICE:
* w/ Navigation System (for HDD):
After the engine switch is turned off, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the engine switch off, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:





* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

NEXT -- Continue to next step.

2. CHECK FOR OPEN IN CAN BUS WIRE (STEERING PAD ECU BRANCH WIRE)

(a) Disconnect the L134 spiral cable connector.





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

Standard resistance:





NG -- REPAIR OR REPLACE STEERING PAD ECU BRANCH WIRE OR CONNECTOR
OK -- Continue to next step.

3. INSPECT SPIRAL CABLE SUB-ASSEMBLY

(a) w/ Transmission Shift Switch:

(1) Disconnect the L134 and z14 cable connectors.





(2) Set the spiral cable to the center position Installation.

(3) Measure the resistance between each terminal of the spiral cable according to the table below.

(4) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance as shown. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance as shown.

Standard resistance:





(5) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance as shown. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance as shown.

Standard resistance:





NOTICE:
As the spiral cable may break, do not rotate the spiral cable more than the specified amount.

(b) w/o Transmission Shift Switch:

(1) Disconnect the L134 and z7 cable connectors.





(2) Set the spiral cable to the center position Installation.

(3) Measure the resistance between each terminal of the spiral cable according to the table below.

(4) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance as shown. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance as shown.

Standard resistance:





(5) After setting the spiral cable to the center position, rotate the spiral cable 2.5 times clockwise, and measure the resistance as shown. Then rotate the spiral cable 5 times counterclockwise, and measure the resistance as shown.

Standard resistance:





NOTICE:
As the spiral cable may break, do not rotate the spiral cable more than the specified amount.

NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (STEERING PAD ECU - BATTERY AND BODY GROUND)

(a) Connect the cable to the negative (-) battery terminal.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

(b) Disconnect the L134 spiral cable connector.





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

Standard resistance:





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

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE STEERING PAD SWITCH (STEERING PAD ECU) Removal