Toyota CH-R Service Manual: Entry Exterior Alarm does not Sound

Toyota CH-R Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Entry Function) / Entry Exterior Alarm does not Sound

DESCRIPTION

The smart key system (for Entry Function) uses the wireless door lock buzzer to perform various vehicle exterior warnings. When the conditions of each warning are met, the certification ECU (smart key ECU assembly) sends a buzzer activation request signal to the main body ECU (multiplex network body ECU) via CAN communication and the buzzer sounds.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The smart key system (for Entry Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Entry Function) after confirming that the communication systems are functioning properly.
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When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to Precaution.
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After repair, confirm that no DTCs are output.

PROCEDURE

1.	CHECK WIRELESS DOOR LOCK CONTROL SYSTEM

(a) Check that the function operates normally.

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Result	Proceed to
Wireless door lock function operates normally	A
Wireless door lock function does not operate normally	B

GO TO PROBLEM SYMPTOMS TABLE

2.	READ VALUE USING TECHSTREAM (EACH UNLOCK DETECTION SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Data List.

(e) Read the Data List according to the display on the Techstream.

Body Electrical > Main Body > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
FR Door Lock Pos	Front door RH unlock detection switch signal	UNLOCK or LOCK	UNLOCK: Front door RH unlocked LOCK: Front door RH locked	-
FL Door Lock Pos	Front door LH unlock detection switch signal	UNLOCK or LOCK	UNLOCK: Front door LH unlocked LOCK: Front door LH locked	-
RR-Door Lock Pos SW	Rear door LH and RH unlock detection switch signal	ON or OFF	ON: Rear door LH or rear door RH unlocked OFF: Rear door LH and rear door RH locked	-
RL-Door Lock Pos SW	Rear door LH and RH unlock detection switch signal	ON or OFF	ON: Rear door LH or rear door RH unlocked OFF: Rear door LH and rear door RH locked	-

Body Electrical > Main Body > Data List

Tester Display
FR Door Lock Pos
FL Door Lock Pos
RR-Door Lock Pos SW
RL-Door Lock Pos SW

OK:

The Techstream display changes correctly in response to the lock/unlock operation.

GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit)

3.	PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS BUZZER)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Main Body / Active Test.

(e) Perform Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Wireless Buzzer	Wireless door lock buzzer	OFF/ON	-

Body Electrical > Main Body > Active Test

Tester Display
Wireless Buzzer

Result	Proceed to
Wireless door lock buzzer does not sound	A
Wireless door lock buzzer sounds	B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

4.	CHECK WIRELESS DOOR LOCK BUZZER

(a) Disconnect the A24 wireless door lock buzzer connector.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Main Body / Active Test.

(f) Perform Active Test according to the display on the Techstream.

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Wireless Buzzer	Wireless door lock buzzer	OFF/ON	-

Body Electrical > Main Body > Active Test

Tester Display
Wireless Buzzer

(g) While performing the Active Test, measure the voltage between the terminals of the wireless door lock buzzer.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A24-1 (B) - A24-2 (E)

Active Test Wireless Buzzer ON

Pulse generation

(frequency: 2 kHz, high voltage: 11 to 14 V, low voltage: below 1 V)

Active Test Wireless Buzzer OFF

Below 1 V

*a	Front view of wire harness connector (to Wireless Door Lock Buzzer)

REPLACE WIRELESS DOOR LOCK BUZZER

5.	CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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(b) Disconnect the A24 wireless door lock buzzer connector.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A24-1 (B) - MB-21 (BZR)	Always	Below 1 Ω
A24-2 (E) - Body ground	Always	Below 1 Ω
A24-1 (B) or MB-21 (BZR) - Body ground	Always	10 kΩ or higher

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

6.	CHECK HARNESS AND CONNECTOR (WIRELESS DOOR LOCK BUZZER - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the 3F instrument panel junction block assembly connector.

(b) Disconnect the A24 wireless door lock buzzer connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
A24-1 (B) - 3F-29	Always	Below 1 Ω
A24-1 (B) or 3F-29 - Body ground	Always	10 kΩ or higher

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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