DTC U0127:00

id020200801300

DESCRIPTION

Communication error with keyless receiver

DETECTION CONDITION

•  Communication error between instrument cluster and keyless receiver.

POSSIBLE CAUSE

•  Keyless receiver connector or terminals malfunction

•  BCM connector or terminals malfunction

•  Instrument cluster connector or terminals malfunction

•  Short to ground in wiring harness between the following terminals:

―  Keyless receiver terminal D—BCM terminal 6W—Instrument cluster terminal 2W

•  Short to power supply in wiring harness between the following terminals:

―  Keyless receiver terminal D—BCM terminal 6W—Instrument cluster terminal 2W

•  Open circuit in wiring harness between the following terminals:

―  Keyless receiver terminal D—BCM terminal 6W—Instrument cluster terminal 2W

•  Keyless receiver malfunction

•  BCM malfunction

•  Instrument cluster malfunction

DESCRIPTION	Communication error with keyless receiver
DETECTION CONDITION	• Communication error between instrument cluster and keyless receiver.
POSSIBLE CAUSE	• Keyless receiver connector or terminals malfunction • BCM connector or terminals malfunction • Instrument cluster connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― Keyless receiver terminal D—BCM terminal 6W—Instrument cluster terminal 2W • Short to power supply in wiring harness between the following terminals: ― Keyless receiver terminal D—BCM terminal 6W—Instrument cluster terminal 2W • Open circuit in wiring harness between the following terminals: ― Keyless receiver terminal D—BCM terminal 6W—Instrument cluster terminal 2W • Keyless receiver malfunction • BCM malfunction • Instrument cluster malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT KEYLESS RECEIVER CONNECTOR AND TERMINALS • Switch the ignition to off. • Disconnect the negative battery cable. • Disconnect the keyless receiver connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
1		No	Go to the next step.
2	INSPECT BCM CONNECTOR AND TERMINALS • Disconnect the BCM connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
2		No	Go to the next step.
3	INSPECT INSTRUMENT CLUSTER CONNECTOR AND TERMINALS • Disconnect the instrument cluster connector. • Inspect the connector and terminals (corrosion, damage, pin disconnection). • Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to Step 9.
3		No	Go to the next step.
4	INSPECT WHEEL UNIT SIGNAL CIRCUIT FOR SHORT TO GROUND • Keyless receiver, BCM and instrument cluster connectors are disconnected. • Inspect for continuity between the following terminal (wiring harness-side) and body ground: ― Keyless receiver terminal D • Is there continuity?	Yes	Repair or replace the wiring harness for a possible short to ground, then go to Step 9.
4		No	Go to the next step.
5	INSPECT WHEEL UNIT SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Keyless receiver, BCM and instrument cluster connectors are disconnected. • Reconnect the negative battery cable. • Switch the ignition to ON. • Measure the voltage at the following terminal (wiring harness-side): ― Keyless receiver terminal D • Is there any voltage?	Yes	Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
5		No	Go to the next step.
6	INSPECT WHEEL UNIT SIGNAL CIRCUIT FOR OPEN CIRCUIT • Keyless receiver, BCM and instrument cluster connectors are disconnected. • Switch the ignition to off. • Disconnect the negative battery cable. • Inspect for continuity between following terminals (wiring harness-side): ― Keyless receiver terminal D—BCM terminal 6W ― Keyless receiver terminal D—Instrument cluster terminal 2W • Is there continuity?	Yes	Go to the next step.
6		No	Repair or replace the wiring harness for a possible open circuit, then go to Step 9.
7	INSPECT KEYLESS RECEIVER • Reconnect the keyless receiver, BCM and instrument cluster connectors. • Reconnect the negative battery cable. • Inspect the keyless receiver. (See KEYLESS RECEIVER INSPECTION [KEYLESS ENTRY SYSTEM].) • Is there any malfunction?	Yes	Replace the keyless receiver, then go to Step 9. (See KEYLESS RECEIVER REMOVAL/INSTALLATION [KEYLESS ENTRY SYSTEM].)
7		No	Go to the next step.
8	CONFIRM BCM DTC • Retrieve the BCM DTC using the M-MDS. (See DTC INSPECTION [BCM].) • Are any DTCs display?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [BCM].)
8		No	Go to the next step.
9	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect the disconnected connectors. • Reconnect the negative battery cable. • Clear the DTC from the instrument cluster memory using the M-MDS. (See TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS.) • Switch the ignition to ON and wait for 30 s or more. • Retrieve the TPMS DTC using the M-MDS. (See TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS.) • Is the same DTC present?	Yes	Replace the instrument cluster, then go to the next step. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
9		No	Go to the next step.
10	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS.)
10		No	DTC troubleshooting completed.