DTC P1618: Keyless Start Control Module Can Communication Error (For Vehicle With Keyless Start System): Troubleshooting

TROUBLESHOOTING CHART

Step	Action	YES	NO
1	Diagnostic Trouble Code (DTC) confirmation Clear DTC(s) referring to DIAGNOSTIC TROUBLE CODE (DTC) CLEARANCE . Turn the ignition switch to OFF position. Check if any DTC is detected referring to DIAGNOSTIC TROUBLE CODE (DTC) CHECK . Is DTC P1618 still detected?	Go to Step 2.	The troubleshooting is completed.
2	Diagnostic Trouble Code (DTC) check in ECM Is any DTC other than P1618 detected in Step 1?	Perform the troubleshooting. Refer to appropriate DTC diagnostics.	Go to Step 3.
3	Poor connection check at ECM, ABS control module and keyless start control module connectors With the ignition key at OFF position, check each connector and wire terminal at ECM, ABS control module or ESP® control module and keyless control module for secure connection. Is each connector and wire terminal connected securely?	Go to Step 4.	Repair poor connection(s).
4	Check for open and high resistance in CAN communication wire circuits between ABS control module or ESP® control module and keyless start control module Disconnect connector "E03" from ABS control module or "E53" from ESP® control module. Disconnect connector "G42" from keyless start control module referring to KEYLESS START CONTROL MODULE REMOVAL AND INSTALLATION . Measure resistance at the following wire terminals. Vehicle not equipped with ESP® system Between "E03-12" wire terminal at ABS control module connector and "G42-19" wire terminal at keyless start control module connector Between "E03-6" wire terminal at ABS control module connector and "G42-18" wire terminal at keyless start control module connector Vehicle equipped with ESP® system Between "E53-13" wire terminal at ESP® control module connector and "G42-19" wire terminal at keyless start control module connector Between "E53-44" wire terminal at ESP® control module connector and "G42-18" wire terminal at keyless start control module connector Is each resistance 1 Ω or less?	Go to Step 5.	Repair open or high resistance in malfunctioning wire circuit.
5	Check for short between CAN communication wire circuits between ABS control module or ESP® control module and keyless start control module Disconnect connector "G31" from BCM connector referring to BCM REMOVAL AND INSTALLATION . Disconnect connector "G28" from combination meter referring to COMBINATION METER REMOVAL AND INSTALLATION . Vehicle not equipped with ESP® system Measure resistance between "E03-12" wire terminal at ABS control module connector and "G42-18" wire terminal at keyless start control module connector Vehicle equipped with ESP® system Measure resistance between "E53-13" wire terminal at ESP® control module connector and "G42-18" wire terminal at keyless start control module connector Is resistance infinite?	Go to Step 6.	Repair short between CAN communication wire circuits.
6	Check for short to ground wire circuit in CAN communication wire circuits Measure resistance at the following wire terminals. Vehicle not equipped with ESP® system Between "E03-6" wire terminal at ABS control module connector and body ground Between "E03-12" wire terminal at ABS control module connector and body ground Vehicle equipped with ESP® system Between "E53-13" wire terminal at ESP® control module connector and body ground Between "E53-44" wire terminal at ESP® control module connector and body ground Is resistance infinite?	Go to Step 7.	Repair short to ground wire circuit in CAN communication wire circuits.
7	Check for short to power supply wire circuit in CAN communication wire circuits Measure resistance at the following wire terminals with the ignition switch at ON position. Vehicle not equipped with ESP® system Between "E03-6" wire terminal at ABS control module connector and body ground Between "E03-12" wire terminal at ABS control module connector and body ground Vehicle equipped with ESP® system Between "E53-13" wire terminal at ESP® control module connector and body ground Between "E53-44" wire terminal at ESP® control module connector and body ground Is voltage 0 V?	Go to Step 8.	Repair short to power supply wire circuit in CAN communication wire circuits.
8	Check of keyless start control module power and ground wire circuits Check keyless start control module power and ground wire circuits referring to KEYLESS START CONTROL MODULE POWER AND GROUND CIRCUIT CHECK . Are they in normal?	Replace keyless start control module with a known-good one and recheck.	Repair malfunctioning wire circuit.