#
PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION

BHE090255430W04

## System Wiring Diagram

1 | Wiring harness 1 | Front harness
2 | Wiring harness 2
3 | Wiring harness 3
4 | Wiring harness 4
5 | Wiring harness 5
6 | Wiring harness 6 | Rear harness
7 | Wiring harness 7
8 | Wiring harness 8 | Instrument panel harness
9 | Wiring harness 9
10 | Wiring harness 10

## PCM

1. Check the display of DTC U0121 and/or U0155, using the SST (WDS or equivalent). (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

2. Referring to the following table, determine the malfunctioning part of the CAN system.

Module | Communication status | Malfunction location
--- | --- | ---
DSC HU/CM | TCM | Instrument cluster
PCM | Error | Error | Error | • Wiring harness 1 • Wiring harness 3 • PCM
Error | OK | OK | • Wiring harness 5 • DSC HU/CM
OK | Error | OK | • Wiring harness 3 • TCM
OK | OK | Error | • Wiring harness 6 • Wiring harness 8 • Wiring harness 10 • Instrument cluster

## EPS Control Module

1. Check the display of DTC U1900, using the SST (WDS or equivalent). (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

Malfunction location

  • Wiring harness 1
  • Wiring harness 2
  • Wiring harness 3
  • Wiring harness 5
  • PCM
  • DSC HU/CM
  • EPS control module

## DSC HU/CM

1. Check the display of DTC U1900, using the SST (WDS or equivalent). (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

Malfunction location

  • Wiring harness 1
  • Wiring harness 3
  • Wiring harness 5
  • Wiring harness 6
  • Wiring harness 8
  • Wiring harness 11
  • PCM
  • Steering angle sensor
  • DSC HU/CM

## TCM

1. Check the display of DTC U0100, using the SST (WDS or equivalent). (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

Malfunction location

  • Wiring harness 1
  • Wiring harness 3
  • Wiring harness 4
  • PCM
  • TCM

## Keyless Unit

1. Check the display of DTC U1900, using the SST (WDS or equivalent). (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

Malfunction location

  • Wiring harness 1
  • Wiring harness 3
  • Wiring harness 6
  • Wiring harness 7
  • PCM
  • Keyless unit

## Steering Angle Sensor

1. Check the display of DTC U1900, using the SST (WDS or equivalent). (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

Malfunction location

  • Wiring harness 9
  • DSC HU/CM
  • Steering angle sensor

## Instrument Cluster

1. Access and monitor the "PCM_MSG", "EPS_MSG", "TCM_MSG" and "ABS_MSG" of PID using the SST (WDS or equivalent).

2. Referring to the PID/DATA MONITOR, confirm the display status of the PID. (See PID/DATA MONITOR TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

3. Referring to the following table, determine the malfunctioning part of the CAN system.

Module | Communication status | Malfunction location
--- | --- | ---
TCM | DSC HU/CM | EPS control module | PCM
Instrument cluster | Error | Error | Error | Error | • Wiring harness 8 • Wiring harness 10 • Instrument cluster
Error | OK | OK | OK | • Wiring harness 4 • TCM
OK | Error | OK | OK | • Wiring harness 5 • Wiring harness 6 • DSC HU/CM
OK | OK | Error | OK | • Wiring harness 2 • Wiring harness 3 • EPS control module
OK | OK | OK | Error | • Wiring harness 1 • PCM