Initial Inspection and Diagnostic Overview

How to Troubleshoot the Multiplex Integrated Control System

Troubleshooting CAN Circuit Related Problems

NOTE: Check the PCM for DTCs and troubleshoot PCM Initial Inspection and Diagnostic Overview 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 codes with the HDS.

First method: Select the system that has the problem from the BODY ELECTRICAL SELECTION MENU, then 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.

Without HDS (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 there are DTCs 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. Refer to the loss of communication cross reference chart.

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 gauge control module

1. Set the 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, the DTCs, which have been detected and stored individually by various B-CAN units, will be shown one by one on the multi-information display on the gauge control module when communication between the MICU and the gauge control module is normal. To scroll through the DTCs, press the SEL/RESET button.

Information display type





Multi-information display type





3. The unit that has stored the code can be identified by the number shown on the multi-information display.






How to clear DTCs

1. Enter the 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 Model 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 circuit, the other control units will 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 circuit.

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.









TX: Transmitting unit does not set a loss of communication DTC.