Toyota CH-R Service Manual: No Answer-Back

Toyota CH-R Service Manual / Door Lock / Wireless Door Lock Control System(w/o Smart Key System) / No Answer-Back

DESCRIPTION

In some cases, wireless door lock control functions are normal but the hazard warning light and wireless door lock buzzer answer-back functions*1 do not operate. In such cases, hazard warning light and wireless door lock buzzer*1 signal outputs from the main body ECU (multiplex network body ECU) may be malfunctioning.

*1: w/ Toyota Safety Sense P

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

The wireless door lock control system key and reminder warning system use the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the wireless door lock control system after confirming that the communication system is functioning properly.

Click here

PROCEDURE

1.	READ VALUE USING TECHSTREAM (Hazard Answer Back, Wireless Buzzer Resp, Wireless Buzzer Vol)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Customize Setting / Wireless Door Lock.

(e) Select the setting by referring to the table below.

Wireless Door Lock

Tester Display	Description	Default	Setting	ECU
Hazard Answer Back	Function that flashes the hazard warning lights once when the doors are locked by wireless operation and twice when the doors are unlocked by wireless operation.	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
Wireless Buzzer Resp	Wireless door lock buzzer response*1	ON	0:OFF,1:ON	Main body ECU (Multiplex network body ECU)
Wireless Buzzer Vol	Wireless door lock buzzer volume*1	Level5	0000:Level7,0001:Level6,0010:Level5,0011:Level4,0100:Level3,0101:Level2,0110:Level1,0111:Level0	Main body ECU (Multiplex network body ECU)

*1: w/ Toyota Safety Sense P

Result	Proceed to
Both items are ON and except Level 0	A
Either item is OFF or Level 0	B

PERFORM CUSTOMIZE FUNCTION

2.	CHECK WIRELESS DOOR LOCK CONTROL FUNCTIONS

(a) Check the wireless door lock control function using the door control transmitter assembly.

Result	Proceed to
Wireless door lock/unlock operates properly	A
Wireless door lock/unlock does not operate properly	B

GO TO PROBLEM SYMPTOMS TABLE

3.	READ VALUE USING TECHSTREAM (FR Door Lock Pos, FL Door Lock Pos, RR-Door Lock Pos SW, RL-Door Lock Pos SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(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	LOCK or UNLOCK	LOCK: Front door RH locked UNLOCK: Front door RH unlocked	-
FL Door Lock Pos	Front door LH unlock detection switch signal	LOCK or UNLOCK	LOCK: Front door LH locked UNLOCK: Front door LH unlocked	-
RR-Door Lock Pos SW	Rear door RH unlock detection switch signal	OFF or ON	OFF: Rear door RH locked ON: Rear door RH unlocked	-
RL-Door Lock Pos SW	Rear door RH unlock detection switch signal	OFF or ON	OFF: Rear door LH locked ON: Rear door LH unlocked	-

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)

4.	CHECK WIRELESS ANSWER-BACK OPERATION

(a) Check the wireless answer-back operation using the door control transmitter assembly.

Result	Proceed to
Only wireless door lock buzzer answer-back does not occur (w/ Toyota Safety Sense P)	A
Only hazard warning light answer-back does not occur	B

GO TO STEP 9

5.	PERFORM ACTIVE TEST USING TECHSTREAM (Wireless Buzzer)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

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

Body Electrical > Main Body > Active Test

Tester Display	Measurement Item	Control Range	Restrict Condition
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 MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

6.	CHECK WIRELESS DOOR LOCK BUZZER

(a) Disconnect the 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

7.	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.

Click here

(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)

8.	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

9.	CHECK HAZARD WARNING LIGHTS OPERATION

(a) Check that the hazard warning lights blink when the hazard warning signal switch is pressed.

OK:

Hazard warning lights blink.

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

GO TO LIGHTING SYSTEM (Proceed to Hazard Warning Switch Circuit)

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