DTC U0127

id020200800600

DESCRIPTION | Communication error between instrument cluster and keyless receiver
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DETECTION CONDITION | • The instrument cluster cannot receive a signal from the keyless receiver.
POSSIBLE CAUSE | • Keyless receiver connector or terminals malfunction • Keyless control module connector or terminals malfunction • Instrument cluster connector or terminals malfunction • Short to ground in the wiring harness between the following terminals: ― Keyless control module terminal 3R—Instrument cluster terminal 2V ― Keyless control module terminal 3S—Keyless receiver terminal A ― Keyless control module terminal 3U—Keyless receiver terminal C • Short to power supply in the wiring harness between the following terminals: ― Keyless control module terminal 3R—Instrument cluster terminal 2V ― Keyless control module terminal 3S—Keyless receiver terminal A ― Keyless control module terminal 3U—Keyless receiver terminal C • Open circuit in the wiring harness between the following terminals: ― Keyless control module terminal 3R—Instrument cluster terminal 2V ― Keyless control module terminal 3S—Keyless receiver terminal A ― Keyless control module terminal 3U—Keyless receiver terminal C • Keyless receiver malfunction • Keyless control module malfunction • Instrument cluster malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | INSPECT KEYLESS RECEIVER CONNECTOR AND TERMINALS • Turn the ignition switch 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.
No | Go to the next step.
2 | INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS • Disconnect the keyless control module 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.
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.
No | Go to the next step.
4 | INSPECT WHEEL UNIT SIGNAL CIRCUIT FOR SHORT TO GROUND • Keyless receiver, keyless control module and instrument cluster connectors are disconnected. • Inspect for continuity between the following terminal (wiring harness-side) and body ground: ― Keyless control module terminal 3R ― Keyless control module terminal 3S ― Keyless control module terminal 3U • Is there continuity? | Yes | Repair or replace the wiring harness for a possible short to ground, then go to Step 9.
No | Go to the next step.
5 | INSPECT WHEEL UNIT SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Keyless receiver, keyless control module and instrument cluster connectors are disconnected. • Reconnect the negative battery cable. • Turn the ignition switch to the ON position. • Measure the voltage at the following terminal (wiring harness-side): ― Keyless control module terminal 3R ― Keyless control module terminal 3S ― Keyless control module terminal 3U • Is there any voltage? | Yes | Repair or replace the wiring harness for a possible short to power supply, then go to Step 9.
No | Go to the next step.
6 | INSPECT WHEEL UNIT SIGNAL CIRCUIT FOR OPEN CIRCUIT • Keyless receiver, keyless control module and instrument cluster connectors are disconnected. • Turn the ignition switch to off position. • Disconnect the negative battery cable. • Inspect for continuity between the following terminals (wiring harness-side): ― Keyless control module terminal 3R—Instrument cluster terminal 2V ― Keyless control module terminal 3S—Keyless receiver terminal A ― Keyless control module terminal 3U—Keyless receiver terminal C • Is there continuity? | Yes | Go to the next step.
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, keyless control module and instrument cluster connectors. • Inspect the keyless receiver. (See KEYLESS RECEIVER INSPECTION.) • Is there any malfunction? | Yes | Replace the keyless receiver, then go to Step 9. (See KEYLESS RECEIVER REMOVAL/INSTALLATION.)
No | Go to the next step.
8 | INSPECT KEYLESS CONTROL MODULE • Inspect the keyless control module. (See KEYLESS CONTROL MODULE INSPECTION.) • Is there any malfunction? | Yes | Replace the keyless control module, then go to the next step. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION.)
No | Go to the next step.
9 | VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect the disconnected connectors. • Reconnect the negative battery cable. • Perform the Clearing DTCs Procedure. (See TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS.) • Turn the ignition switch to the ON position and wait for 30 s or more. • Perform the Reading DTCs Procedure. (See TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS.) • Is the same DTC present? | Yes | Repeat the inspection from Step 1. If the malfunction recurs: • Replace the instrument cluster, then go to the next step. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No | Go to the next step.
10 | VERIFY AFTER REPAIR PROCEDURE • Drive the vehicle at a speed of 25 km/h {15.5 mph} or more for 10 min or more. • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See TIRE PRESSURE MONITORING SYSTEM (TPMS) ON-BOARD DIAGNOSIS.)
No | DTC troubleshooting completed.