DTC U3003:16, U3003:17 [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]

id09021c399400

DETECTION CONDITION
U3003:16
ROOM power supply circuit voltage 4 V—9 V is detected for 10 s
U3003:17
ROOM power supply circuit voltage higher than 16 V is detected for 0.5 s while the engine is running
POSSIBLE CAUSE
•  MAIN 125 A fuse malfunction
•  BTN 40 A fuse malfunction
•  ROOM 15 A fuse malfunction
•  Battery malfunction
•  Connector or terminal malfunction
•  Short circuit to ground or power supply in wiring harness between battery and BCM connector terminal 4B
•  Short circuit to ground or power supply in wiring harness between BCM connector terminal 7N and keyless control module connector terminal 1D
•  Open circuit in wiring harness between battery and BCM connector terminal 4B
•  Open circuit in wiring harness between BCM connector terminal 7N and keyless control module connector terminal 1D
•  BCM malfunction
•  Keyless control module malfunction

Diagnostic Procedure

Step

Inspection

Action
1
INSPECT ROOM 15 A FUSE
•  Switch the ignition to off.
•  Disconnect the negative battery cable.
•  Remove the ROOM 15 A fuse.
•  Inspect the fuse.
•  Is the ROOM 15 A fuse normal?
Yes
Go to the next step.
No
Replace the ROOM 15 A fuse.
After replacement, go to Step 9.
2
INSPECT MAIN 125 A FUSE AND BTN 40 A FUSE
•  Remove the MAIN 125 A fuse and the BTN 40 A fuse.
•  Inspect the fuses.
•  Are the MAIN 125 A fuse and the BTN 40 A fuse normal?
Yes
Go to the next step.
No
Replace the malfunctioning fuse.
After replacement, go to Step 9.
3
INSPECT BATTERY
•  Measure the battery positive voltage.
•  Is the voltage 9—16V?
Yes
Go to the next step.
No
Higher than specification
•  Recharge or replace the battery, then go to Step 9.
Lower than specification
•  Replace or charge the battery, then go to Step 9.
(See BATTERY RECHARGING [L8, LF, L5].)
(See BATTERY RECHARGING [MZR-CD (RF Turbo)].)
(See BATTERY RECHARGING [MZR-CD 2.2].)
(See BATTERY REMOVAL/INSTALLATION [L8, LF, L5].)
(See GENERATOR REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
(See BATTERY REMOVAL/INSTALLATION [MZR-CD 2.2].)
4
INSPECT BCM CONNECTOR CONDITION
•  Disconnect the BCM connector
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is the connector normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to Step 9.
5
INSPECT KEYLESS CONTROL MODULE CONNECTOR CONDITION
•  Disconnect the keyless control module connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Is the connector normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to Step 9.
6
INSPECT WIRING HARNESS BETWEEN BATTERY AND BCM
•  Inspect wiring harness between battery and BCM connector terminal 4B for the following:
―  Short to ground
―  Short to power supply
―  Open circuit
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Repair/replace the wiring harness.
After repair procedure, go to Step 9.
7
INSPECT WIRING HARNESS BETWEEN BCM AND KEYLESS CONTROL MODULE
•  Inspect wiring harness between BCM connector terminal 7N and keyless control module connector terminal 1D for the following:
―  Short to ground
―  Short to power supply
―  Open circuit
•  Is the wiring harness normal?
Yes
Go to the next step.
No
Repair/replace the wiring harness.After repair procedure, go to Step 9.
8
INSPECT BCM
•  Install the ROOM 15 A fuse, MAIN 125 A fuse and BTN 40 A fuse.
•  Reconnect the negative battery cable.
•  Switch the ignition to ON.
•  Measure the voltage at BCM connector terminals 4B and 7N.
•  Is the voltage normal?
Yes
Go to the next step.
No
Replace the BCM.
(See BODY CONTROL MODULE (BCM) REMOVAL/INSTALLATION.)
After replacement, go to the next step.
9
VERIFY DTC
•  Install the ROOM 15 A fuse, MAIN 125 A fuse and BTN 40 A fuse.
•  Reconnect the disconnected connectors and the negative battery cable.
•  Clear DTC using the M-MDS.
•  Verify DTC using the M-MDS.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
If the malfunction recurs, replace the keyless control module.
(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]].)
Go to the next step.
No
Go to the next step.
10
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Are there other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.