DESCRIPTION
When the theft deterrent system is switched from the armed state to the alarm sounding state, the main body ECU (multiplex network body ECU) transmits a signal to cause the security horn assembly to sound at intervals of 0.4 seconds.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
*1: w/ Smart Key System
PROCEDURE
1. |
PERFORM ACTIVE TEST USING TECHSTREAM (SECURITY HORN) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream 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 |
Diagnostic Note |
---|---|---|---|
Security Horn |
Security horn Assembly |
OFF/ON |
- |
Tester Display |
---|
Security Horn |
OK:
The security horn assembly sounds and stops correctly when operated through the Techstream.
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
|
2. |
INSPECT SECURITY HORN ASSEMBLY |
(a) Remove the security horn assembly.
Click here
(b) Inspect the security horn assembly.
Click here
NG | ![]() |
REPLACE SECURITY HORN ASSEMBLY |
|
3. |
INSPECT S-HORN RELAY |
(a) Remove the S-HORN relay from the No. 4 relay block assembly.
(b) Inspect the S-HORN relay.
Click here
NG | ![]() |
REPLACE S-HORN RELAY |
|
4. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the main body ECU (multiplex network body ECU).
Click here
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(b) Disconnect the 3A instrument panel junction block assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3A-20 - MB-29 (SH) |
Always |
Below 1 Ω |
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
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5. |
CHECK HARNESS AND CONNECTOR (BATTERY - S-HORN RELAY) |
(a) Remove the S-HORN relay from the No. 4 relay block assembly.
(b) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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6. |
CHECK HARNESS AND CONNECTOR (S-HORN RELAY - SECURITY HORN ASSEMBLY) |
(a) Remove the S-HORN relay from the No. 4 relay block assembly.
(b) Disconnect the A15 security horn assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
7. |
CHECK HARNESS AND CONNECTOR (S-HORN RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Remove the S-HORN relay from the No. 4 relay block assembly.
(b) Disconnect the 3A instrument panel junction block assembly connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Toyota CH-R Service Manual > Instrument Panel Speaker: Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE
1. INSTALL FRONT NO. 2 SPEAKER ASSEMBLY
NOTICE:
Do not touch the speaker cone.
(a) Engage the claws to install the ...
Toyota CH-R Service Manual > Occupant Classification System: Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Occupant Classification System
DTC No.
Detection Item
Link
B1771
Passenger Side Buckle Switch Circuit Malfunction
B1780
Front Occupant Classification Sensor LH Circui ...