DTC U3003:16 [REAR ONE-TOUCH WALK-IN CONTROL MODULE]

id0902t1992500

Description	Rear one-touch walk-in control module B+ (ROOM) power supply voltage malfunction
Detection condition	• The rear one-touch walk-in control module detects that the battery power supply voltage is a certain value or less.
Fail-safe	• Inhibits the rear one-touch walk-in operation function from being driven for the second-row seat (LH). • Inhibits the rear one-touch walk-in operation function from being driven for the second-row seat (RH).
Possible cause	• DTCs are stored in the PCM. • Battery malfunction • Generator malfunction • Rear one-touch walk-in control module connector or terminal malfunction • Short to ground in wiring harness between MAIN 200A fuse and rear one-touch walk-in control module terminal 1M • INTERIOR2 15 A fuse malfunction • ROOM 25 A fuse malfunction • MAIN 200 A fuse malfunction • Open circuit in wiring harness between battery positive terminal and rear one-touch walk-in control module terminal 1M • Rear one-touch walk-in control module malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY PCM DTCs • Retrieve the PCM DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5T)].) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G 2.5T)].)
1		No	Go to the next step.
2	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION.) • Is the battery normal?	Yes	Go to the next step.
2		No	Recharge or replace the battery, then go to Step 7. (See BATTERY RECHARGING.) (See BATTERY REMOVAL/INSTALLATION.)
3	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].) (See GENERATOR INSPECTION [WITH i-ELOOP (SKYACTIV-G 2.5T)].) • Is the generator normal?	Yes	Go to the next step.
3		No	Replace the generator, then go to Step 7. (See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-G 2.5T)].) (See GENERATOR REMOVAL/INSTALLATION [WITH i-ELOOP (SKYACTIV-G 2.5T)].)
4	INSPECT REAR ONE-TOUCH WALK-IN CONTROL MODULE CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the rear one-touch walk-in control module connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
4		No	Repair or replace the connector, then go to Step 7.
5	INSPECT REAR ONE-TOUCH WALK-IN CONTROL MODULE POWER SUPPLY CIRCUIT • Verify that the rear one-touch walk-in control module connector is disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on) and wait for 1 s or more. • Measure the voltage at the rear one-touch walk-in control module terminal 1M (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the INTERIOR2 15 A, ROOM 25 A fuse and MAIN 200 A fuse. • If the fuse is blown: ? Refer to the wiring diagram and verify whether or not there is a common connector between MAIN 200 A fuse and rear one-touch walk-in control module terminal 1M. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. • Replace the fuse. • If the fuse is damaged: ? Replace the fuse. • If the fuse is normal: ? Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and rear one-touch walk-in control module terminal 1M. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 7.
6	INSPECT REAR ONE-TOUCH WALK-IN CONTROL MODULE • Inspect the rear one-touch walk-in control module. (See REAR ONE-TOUCH WALK-IN CONTROL MODULE INSPECTION.) • Is the rear one-touch walk-in control module normal?	Yes	Go to the next step.
6		No	Replace the rear one-touch walk-in control module, then go to the next step. (See REAR ONE-TOUCH WALK-IN CONTROL MODULE REMOVAL/INSTALLATION.)
7	VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Reconnect all the disconnected connectors with the negative battery terminal disconnected. • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Clear the DTC for the rear one-touch walk-in control module using the M-MDS. (See CLEARING DTC [REAR ONE-TOUCH WALK-IN CONTROL MODULE].) • Retrieve the rear one-touch walk-in control module DTCs using the M-MDS. (See DTC INSPECTION [REAR ONE-TOUCH WALK-IN CONTROL MODULE].) • Is the same DTC displayed?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the rear one-touch walk-in control module. (See REAR ONE-TOUCH WALK-IN CONTROL MODULE REMOVAL/INSTALLATION.) Go to the next step.
7		No	Go to the next step.
8	VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [REAR ONE-TOUCH WALK-IN CONTROL MODULE].)
8		No	DTC troubleshooting completed.