DTC U1A4B:16, U1A4B:17 [REAR VEHICLE MONITORING SYSTEM]

id0902z2888600

DESCRIPTION

Rear vehicle monitoring control module (LH) power supply circuit malfunction

DETECTION CONDITION

U1A4B:16

•  Rear vehicle monitoring control module (LH) power supply voltage is less than 9 V.

U1A4B:17

•  Rear vehicle monitoring control module (LH) power supply voltage is 16 V or more.

POSSIBLE CAUSE

•  Battery malfunction

•  Generator malfunction

•  Rear vehicle monitoring control module (LH) connector or terminals malfunction

•  Short to ground or open circuit in rear vehicle monitoring control module (LH) power supply circuit

―  Short to ground in wiring harness between METER IG 15 A fuse and rear vehicle monitoring control module (LH) terminal F

―  METER IG 15 A fuse malfunction

―  Open circuit in wiring harness between ignition switch (IG1) and rear vehicle monitoring control module (LH) terminal F (vehicles without advanced keyless entry and push button start system)

―  Open circuit in wiring harness between IG1 relay and rear vehicle monitoring control module (LH) terminal F (vehicles with advanced keyless entry and push button start system)

•  Rear vehicle monitoring control module (LH) malfunction

DESCRIPTION	Rear vehicle monitoring control module (LH) power supply circuit malfunction
DETECTION CONDITION	U1A4B:16 • Rear vehicle monitoring control module (LH) power supply voltage is less than 9 V. U1A4B:17 • Rear vehicle monitoring control module (LH) power supply voltage is 16 V or more.
POSSIBLE CAUSE	• Battery malfunction • Generator malfunction • Rear vehicle monitoring control module (LH) connector or terminals malfunction • Short to ground or open circuit in rear vehicle monitoring control module (LH) power supply circuit ― Short to ground in wiring harness between METER IG 15 A fuse and rear vehicle monitoring control module (LH) terminal F ― METER IG 15 A fuse malfunction ― Open circuit in wiring harness between ignition switch (IG1) and rear vehicle monitoring control module (LH) terminal F (vehicles without advanced keyless entry and push button start system) ― Open circuit in wiring harness between IG1 relay and rear vehicle monitoring control module (LH) terminal F (vehicles with advanced keyless entry and push button start system) • Rear vehicle monitoring control module (LH) malfunction

System Wiring Diagram

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*1 :Vehicles without advanced keyless entry and push button start system

*2 :Vehicles with advanced keyless entry and push button start system

Diagnostic Procedure

STEP	INSPECTION		ACTION
1	VERIFY PCM DTCs • Verify the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.8, MZR 2.0, MZR 2.5].) (See ON-BOARD DIAGNOSTIC TEST [MZR 2.0 DISI].) (See ON-BOARD DIAGNOSTIC TEST [MZR-CD 2.2].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.8, MZR 2.0, MZR 2.5].) (See DTC TABLE [MZR 2.0 DISI].) (See DTC TABLE [MZR-CD 2.2].)
1		No	Go to the next step.
2	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].) (See BATTERY INSPECTION [MZR 2.0 DISI].) (See BATTERY INSPECTION [MZR-CD 2.2].) • Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [MZR 1.8, MZR 2.0, MZR 2.5].) (See BATTERY RECHARGING [MZR 2.0 DISI].) (See BATTERY RECHARGING [MZR-CD 2.2].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].) (See BATTERY REMOVAL/INSTALLATION [MZR 2.0 DISI].) (See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)
2		No	Go to the next step.
3	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [MZR 1.8, MZR 2.0, MZR 2.5].) (See GENERATOR INSPECTION [MZR 2.0 DISI].) (See GENERATOR INSPECTION [MZR-CD 2.2].) • Is there any malfunction?	Yes	Replace the generator, then go to Step 6. (See GENERATOR REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].) (See GENERATOR REMOVAL/INSTALLATION [MZR 2.0 DISI].) (See GENERATOR REMOVAL/INSTALLATION [MZR-CD 2.2].)
3		No	Go to the next step.
4	INSPECT REAR VEHICLE MONITORING CONTROL MODULE (LH) CONNECTOR AND TERMINALS • Switch the ignition to off. • Disconnect the negative battery cable. • Disconnect the rear vehicle monitoring control module (LH) 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 6.
4		No	Go to the next step.
5	INSPECT REAR VEHICLE MONITORING CONTROL MODULE (LH) CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT • Rear vehicle monitoring control module (LH) connector is disconnected. • Reconnect the negative battery cable. • Switch the ignition to ON. • Measure the voltage at the rear vehicle monitoring control module (LH) terminal F (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the METER IG 15 A fuse. • If the fuse is melt: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the fuse. • If the fuse is deterioration: ― Replace the fuse. • If the fuse is normal: ― Repair or replace the wiring harness for a possible open circuit. Go to the next step.
6	VERIFY TROUBLESHOOTING COMPLETED • Make sure to reconnect all disconnected connectors. • Reconnect the negative battery cable. • Clear the DTC from the rear vehicle monitoring control module using the M-MDS. (See CLEARING DTC [REAR VEHICLE MONITORING SYSTEM].) • Verify the rear vehicle monitoring system DTC using the M-MDS. (See DTC INSPECTION [REAR VEHICLE MONITORING SYSTEM].) • Is the same DTC present?	Yes	Replace the rear vehicle monitoring control module (LH), then go to the next step. (See REAR VEHICLE MONITORING CONTROL MODULE REMOVAL/INSTALLATION.)
6		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [REAR VEHICLE MONITORING SYSTEM].)
7		No	DTC troubleshooting completed.