Initial Inspection and Diagnostic Overview

How to Troubleshoot the Multiplex Integrated Control System

Troubleshooting CAN Circuit Related Problems

NOTE: Check the ECM/PCM for DTCs and troubleshoot ECM/PCM How to Troubleshoot the Fuel and Emissions Systems or F-CAN loss of communication errors first.

Using the HDS (Preferred method)

Connect the HDS to the Data Link Connector (DLC).

NOTE: There are two ways to read B-CAN code with the HDS.

First method; On the HDS, select BODY ELECTRICAL, then select the subsystem that relates to the problem (for example: door locks, keyless, security, etc.), and then last, select the DTCs.

Second method; Ground the SCS circuit with the HDS, then read the DTCs displayed in the multi-information display (MID) in the gauge control module, then go to B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A.

Using B-CAN System Diagnosis Test Mode 1 (Use only if the HDS is unavailable)

1. Check for communication circuit problems using B-CAN System Diagnostic Test Mode 1 Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (Without the HDS).

2. Check for DTCs.

3. If multiple DTCs are stored, sort them, and then troubleshoot the DTCs in this order:

1. Battery voltage DTCs

2. Internal error DTCs

3. Loss of communication DTCs
NOTE: If DTC U1280 is stored, troubleshoot DTC U1280 first U1280.

4. Signal error DTCs

4. If no DTCs are retrieved, use B-CAN System Diagnostic Test Mode 2 to check all inputs related to the failure Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (Without the HDS).

How to Display DTCs on the MID of the Gauge Control Module

Enter the B-CAN System Diagnosis Test Mode 1 Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (Without the HDS). While in Test Mode 1, with normal communication between the MICU and gauge control module, the DTCs which have been detected and stored individually by various B-CAN (Body-controller Area Network) units are shown one by one on the multi-information display. To scroll through the DTCs, press the SEL/RESET button.





The unit that has stored the code can be identified by the number shown after the letter "PA" on the multi-information display (MID).






How to Clear DTCs

1. Enter B-CAN System Diagnosis Test Mode 1 Troubleshooting - B-CAN System Diagnosis Test Mode 1 and Test Mode 2 (Without the HDS).

2. While in Test Mode 1, press and hold down the SEL/RESET button for at least 10 seconds to clear the DTCs.

Loss of Communication DTC Cross-Reference Chart

When an ECU on the CAN circuit is unable to communicate with the other ECUs on the B-CAN and F-CAN circuits, the other control units set loss of communication DTCs. Use this chart to find the control unit that is not communicating with the other control units on the CAN circuits.

1. Find the Transmitting Control Unit that is in the same row as all of the loss of communication DTCs retrieved.

2. Do the input test for the transmitting control unit.

BUS OFF and Internal Error Codes





Loss of Communication