DESCRIPTION
The main body ECU (multiplex network body ECU) stores this DTC when communication with the double lock door control relay assembly stops for 10 seconds or more.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
B1249 |
Double Locking ECU Communication Stop |
No communication between double lock door control relay assembly and main body ECU (multiplex network body ECU) for 10 seconds or more |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
(c) Measure the resistance according to the value(s) in the table below.
HINT:
This inspection is to check the LIN communication line in the instrument panel junction block assembly that connects the wire harness to the built-in main body ECU (multiplex network body ECU).
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3D-17 - MB-16 (LIN2) |
Always |
Below 1 Ω |
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
2. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY) |
(a) Disconnect the F14 double lock door control relay assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
NOTICE:
Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
3D-17 - F14-9 (LIN) |
Ignition switch off |
Below 1 Ω |
F14-9 (LIN) or 3D-17 - Body ground |
Ignition switch off |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK HARNESS AND CONNECTOR (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY - BATTERY, BODY GROUND) |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F14-12 (+B) - F14-7 (GND) |
Always |
11 to 14 V |
F14-11 (CPUB) - F14-7 (GND) |
Always |
11 to 14 V |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F14-7 (GND) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
REPLACE DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY |
(a) Replace the double lock door control relay assembly.
Click here
|
5. |
CHECK FOR DTC |
(a) Clear the DTCs.
Click here
(b) Recheck for DTCs.
Body Electrical > Main Body > Trouble CodesOK:
DTC B1249 is not output.
OK | ![]() |
END (DOUBLE LOCK DOOR CONTROL RELAY ASSEMBLY WAS DEFECTIVE) |
NG | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
Toyota CH-R Service Manual > Lighting System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer
to Registration.*1
Click here
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