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

id0902e1388700

Description

• P1794:16: Keyless control module power supply circuit voltage is less than 9 V

• P1794:17: Keyless control module power supply circuit voltage is 16 V or more

Possible Causes

• Battery malfunction

• Generator malfunction

• Keyless control module connector or terminals malfunction

• Short to ground or open circuit in keyless control module power supply circuit

― Short to ground in wiring harness between P/W 20 A fuse and keyless control module terminal 1E

― P/W 20 A fuse malfunction

― MAIN 200 A fuse malfunction

― Open circuit in wiring harness between battery positive terminal and keyless control module terminal 1E

• Keyless control module malfunction

System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action

1

VERIFY PCM DTC

•  Perform the PCM DTC inspection using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].)

(See MZ-CD 1.6.)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [MZR 1.3, MZR 1.5].)

(See MZ-CD 1.6.)

No

Go to the next step.

2

INSPECT BATTERY

•  Inspect the battery.
(See BATTERY INSPECTION [MZR 1.3, MZR 1.5].)

(See BATTERY INSPECTION [MZ-CD 1.6].)

•  Is there any malfunction?

Yes

Recharge or replace the battery, then go to Step 6.

(See BATTERY RECHARGING [MZR 1.3, MZR 1.5].)

(See BATTERY RECHARGING [MZ-CD 1.6].)

(See BATTERY REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

(See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6].)

No

Go to the next step.

3

INSPECT GENERATOR

•  Inspect the generator.
(See GENERATOR INSPECTION [MZR 1.3, MZR 1.5].)

(See GENERATOR INSPECTION [MZ-CD 1.6].)

•  Is there any malfunction?

Yes

Replace the generator, then go to Step 6.

(See GENERATOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)

(See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6].)

No

Go to the next step.

4

INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS

•  Turn the ignition switch to the LOCK position.

•  Disconnect the negative battery cable.

•  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 6.

No

Go to the next step.

5

INSPECT KEYLESS CONTROL MODULE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND

•  Verify that the keyless control module connector is disconnected.

•  Reconnect the negative battery cable.

•  Measure the voltage at the keyless control module terminal 1E (wiring harness-side).

•  Is the voltage B+?

Yes

Go to the next step.

No

Inspect the P/W 20 A fuse and MAIN 200 A fuse.

•  If the fuse is melt:

―  Repair or replace the wiring harness for a possible short to ground.

―  Replace the malfunctioning fuse.

•  If the fuse is deterioration:

―  Replace the malfunctioning 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 DTCs using the M-MDS.
(See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].)

•  Perform the keyless control module DTC inspection using the M-MDS.
(See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].)

•  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 AND START SYSTEM].)

Go to the next step.

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 [ADVANCED KEYLESS AND START SYSTEM].)

No

DTC troubleshooting completed.

Step	Inspection		Action
1	VERIFY PCM DTC • Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [MZR 1.3, MZR 1.5].) (See MZ-CD 1.6.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [MZR 1.3, MZR 1.5].) (See MZ-CD 1.6.)
1		No	Go to the next step.
2	INSPECT BATTERY • Inspect the battery. (See BATTERY INSPECTION [MZR 1.3, MZR 1.5].) (See BATTERY INSPECTION [MZ-CD 1.6].) • Is there any malfunction?	Yes	Recharge or replace the battery, then go to Step 6. (See BATTERY RECHARGING [MZR 1.3, MZR 1.5].) (See BATTERY RECHARGING [MZ-CD 1.6].) (See BATTERY REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].) (See BATTERY REMOVAL/INSTALLATION [MZ-CD 1.6].)
2		No	Go to the next step.
3	INSPECT GENERATOR • Inspect the generator. (See GENERATOR INSPECTION [MZR 1.3, MZR 1.5].) (See GENERATOR INSPECTION [MZ-CD 1.6].) • Is there any malfunction?	Yes	Replace the generator, then go to Step 6. (See GENERATOR REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].) (See GENERATOR REMOVAL/INSTALLATION [MZ-CD 1.6].)
3		No	Go to the next step.
4	INSPECT KEYLESS CONTROL MODULE CONNECTOR AND TERMINALS • Turn the ignition switch to the LOCK position. • Disconnect the negative battery cable. • 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 6.
4		No	Go to the next step.
5	INSPECT KEYLESS CONTROL MODULE POWER SUPPLY CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND • Verify that the keyless control module connector is disconnected. • Reconnect the negative battery cable. • Measure the voltage at the keyless control module terminal 1E (wiring harness-side). • Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect the P/W 20 A fuse and MAIN 200 A fuse. • If the fuse is melt: ― Repair or replace the wiring harness for a possible short to ground. ― Replace the malfunctioning fuse. • If the fuse is deterioration: ― Replace the malfunctioning 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 DTCs using the M-MDS. (See CLEARING DTC [ADVANCED KEYLESS AND START SYSTEM].) • Perform the keyless control module DTC inspection using the M-MDS. (See DTC INSPECTION [ADVANCED KEYLESS AND START SYSTEM].) • 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 AND START SYSTEM].) Go to the next step.
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 [ADVANCED KEYLESS AND START SYSTEM].)
7		No	DTC troubleshooting completed.