DTC P1794:16, P1794:17 [ADVANCED KEYLESS AND START SYSTEM]

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Detection Condition

• Keyless control module power supply voltage is other than 9—16 V

Possible Causes

• P/W 20 A fuse malfunction

• Open or short circuit in wiring harness between battery and keyless control module

• Battery malfunction

• Keyless control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

FUSE INSPECTION

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  Remove the P/W 20 A fuse.

•  Is the fuse normal?

Yes

Go to the next step.

No

Replace the fuse.

2

BATTERY INSPECTION

•  Measure the battery positive voltage.

•  Is the voltage between 9—16 V?

Yes

Go to the next step.

No

Higher than specification

•  Replace or inspection the battery.
(See BATTERY INSPECTION [ZJ, ZY].)

(See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].)

•  Go to Step 5.

Lower than specification

•  Replace or charge the battery.
(See BATTERY RECHARGING [ZJ, ZY].)

(See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].)

•  Go to Step 5.

3

INSPECT KEYLESS CONTROL MODULE CONNECTOR

•  Disconnect the keyless control module connector.

•  Inspect the keyless control module connector. (Corrosion, damage, and disconnected pins)

•  Are the connector and terminals normal?

Yes

Go to the next step.

No

Repair/replace the keyless control module connector or terminal.

4

INSPECT WIRING HARNESS BETWEEN BATTERY AND KEYLESS CONTROL MODULE

•  Inspect the wiring harnesses between the battery 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 or replace the wiring harness between the battery and keyless control module.

5

VERIFY DTCs

•  Reconnect the disconnected connectors.

•  Connect the negative battery cable.

•  Clear DTCs using the M-MDS.
(See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].)

•  Verify DTCs using the M-MDS.
(See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].)

•  Is DTCs displayed?

―  P1794:16

―  P1794:17

Yes

Replace the keyless control module.

(See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	FUSE INSPECTION • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • Remove the P/W 20 A fuse. • Is the fuse normal?	Yes	Go to the next step.
1		No	Replace the fuse.
2	BATTERY INSPECTION • Measure the battery positive voltage. • Is the voltage between 9—16 V?	Yes	Go to the next step.
2		No	Higher than specification • Replace or inspection the battery. (See BATTERY INSPECTION [ZJ, ZY].) (See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].) • Go to Step 5. Lower than specification • Replace or charge the battery. (See BATTERY RECHARGING [ZJ, ZY].) (See BATTERY REMOVAL/INSTALLATION [ZJ, ZY].) • Go to Step 5.
3	INSPECT KEYLESS CONTROL MODULE CONNECTOR • Disconnect the keyless control module connector. • Inspect the keyless control module connector. (Corrosion, damage, and disconnected pins) • Are the connector and terminals normal?	Yes	Go to the next step.
3		No	Repair/replace the keyless control module connector or terminal.
4	INSPECT WIRING HARNESS BETWEEN BATTERY AND KEYLESS CONTROL MODULE • Inspect the wiring harnesses between the battery 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.
4		No	Repair or replace the wiring harness between the battery and keyless control module.
5	VERIFY DTCs • Reconnect the disconnected connectors. • Connect the negative battery cable. • Clear DTCs using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].) • Verify DTCs using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].) • Is DTCs displayed? ― P1794:16 ― P1794:17	Yes	Replace the keyless control module. (See KEYLESS CONTROL MODULE REMOVAL/INSTALLATION [ADVANCED KEYLESS AND START SYSTEM].)
5		No	DTC troubleshooting completed.