Troubleshooting the CAN circuit related problems
Using the HDS (Preferred method)

1. Go to B-CAN system diagnosis test mode A.

1. If no DTCs are retrieved, go to Test Mode C or D.

Without the HDS (Should be used if the HDS is unavailable)

1. Check for communication circuit problems using Mode 1.

1. Check for DTCs while in Mode A.

1. Sort, and then troubleshoot the DTCs in the order. Refer to the DTC troubleshooting for DTC descriptions.

   1st. | Internal Error DTCs
   2nd. | Loss of communication DTCs
   3rd. | Signal Error DTCs

1. If no DTCs are retrieved, use mode 2 to check all inputs related to failure.

NOTE: Not all inputs apply to all trim levels.

Relay Control Module
Input signal | Output signal/Device
--- | ---
A/C pressure switch, Climate control switch, Hood switch, Horn switch, Windshield wiper motor | Headlight, Parking light, Horn, Windshield washer motor, Windshield wiper motor

Door Multiplex Control Unit
Input signal | Output signal
--- | ---
Driver's door key cylinder switch (lock/unlock), Driver's door lock knob switch (lock/unlock), Driver's door lock switch, Driver's power window switches (up, down, auto up, auto down), Passenger's power window switches (up, down), Driver's power window motor pulser | Driver's power window motor, Passenger's power window switches, Power window relay control

Multiplex Integrated Control Unit
Input signal | Output signal/Device
--- | ---
Audio unit security ground, Brake pedal position switch, Door switches, Ignition key cylinder switch, Park pin switch (A/T), Passenger's door lock knob switches (unlock), Passenger's door lock switch, Power window motor, Seat belt switch (unbuckled), Transmission range switch (P, R position), Trunk latch switch | Door lock actuators, Hazard warning lights, Interior lights, Ignition key light, Key interlock solenoid, Trunk lock actuator, Turn signal lights, Trunk lid opener solenoid, Door curtesy lights

Gauge Control Module
Input signal | Output signal/Device
--- | ---
Dash lights brightness controller volume, Engine oil pressure switch signal, Parking brake switch, Brake fluid level switch, Fuel level sensor, Select/Reset switch | Dash lights, Fuel gauge, Gauge lights, Indicator, LEDs, Speedometer, Tachometer, ECT gauge, Warning buzzer, Odometer/Outside temperature display

Climate Control Unit
Input signal | Output signal/Device
--- | ---
Evaporator temperature sensor, In-car temperature sensor, Outside air temperature sensor, Sunlight sensor, Air mix motor position (Driver's + Passenger's with dual zone), Mode motor position, Blower motor control feed back | Air mix control motors (Driver's/Passenger's), Blower motor transistor, Mode control motor, Rear deffogger relay, A/C request, Recirculation motor

Hands Free Telephone Control Unit
Input signal | Output signal/Device
--- | ---
Remove switched, Microphone, Bluetooth communication with cellular phone | Hands free telephone information