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:
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Click here
PROCEDURE
1. |
CHECK CUSTOMIZE SETTING (WIRELESS BUZZER RESP) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Customize Setting / Wireless Door Lock.
Wireless Door Lock
Tester Display |
Description |
Default |
Setting |
ECU |
---|---|---|---|---|
Wireless Buzzer Resp |
Wireless buzzer response |
ON |
0:OFF,1:ON |
Main body ECU (multiplex network body ECU) |
Result |
Proceed to |
---|---|
"ON" is displayed |
A |
"OFF" is displayed |
B |
B |
PERFORM CUSTOMIZE SETTING |
|
2. |
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 |
B |
GO TO PROBLEM SYMPTOMS TABLE |
|
3. |
READ VALUE USING TECHSTREAM (EACH UNLOCK DETECTION SWITCH) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream 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 |
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 |
- |
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.
NG |
GO TO LIGHTING SYSTEM (Proceed to Door Unlock Detection Switch Circuit) |
|
4. |
PERFORM ACTIVE TEST USING TECHSTREAM (WIRELESS BUZZER) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(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 |
- |
Tester Display |
---|
Wireless Buzzer |
Result |
Proceed to |
---|---|
Wireless door lock buzzer does not sound |
A |
Wireless door lock buzzer sounds |
B |
B |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
5. |
CHECK WIRELESS DOOR LOCK BUZZER |
(a) Disconnect the A24 wireless door lock buzzer connector.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG).
(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 |
- |
Tester Display |
---|
Wireless Buzzer |
(g) While performing the Active Test, measure the voltage between the terminals of the wireless door lock buzzer. Standard Voltage:
|
|
OK |
REPLACE WIRELESS DOOR LOCK BUZZER |
|
6. |
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.
(c) Reconnect the 3F instrument panel junction block assembly 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 |
OK |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
7. |
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.
(c) Measure the resistance according to the value(s) in the table below.
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 |
OK |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Toyota CH-R Service Manual > Steering Lock System: Power Source Control ECU Malfunction (B2782)
DESCRIPTION
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This DTC is stored when the IGEI input (the steering lock motor activation permission
signal) sent directly from the certification ECU (smart key ECU assembly) to the
steering lock ECU (ste ...
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