DESCRIPTION
The door control receiver is used to receive electrical waves relating to the entry functions of the smart key system. The certification ECU (smart key ECU assembly) decodes the requested smart key system operation by identifying a key code based on the radio waves received via the door control receiver. The door control receiver receives a signal from the door control transmitter and sends signals to the main body ECU (driver side junction block assembly) through the certification ECU (smart key ECU assembly). The certification ECU (smart key ECU assembly) then sends a command, according to the requested operation, to each ECU (ex. if door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (driver side junction block assembly)).
DTC No. |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1242 |
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU AND BODY GROUND) |
(a) Disconnect the D25 and D26 certification ECU (smart key ECU assembly) connectors.
(b) Disconnect the M16 door control receiver connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D26-16 (RSSI) - M16-2 (RSSI) |
Always |
Below 1 Ω |
D26-15 (RDA) - M16-5 (DATA) |
Always |
Below 1 Ω |
D26-5 (RC0) - M16-4 (+5) |
Always |
Below 1 Ω |
D25-15 (E) - Body ground |
Always |
Below 1 Ω |
M16-1 (GND) - Body ground |
Always |
Below 1 Ω |
D26-16 (RSSI) or M16-2 (RSSI) - Body ground |
Always |
10 kΩ or higher |
D26-15 (RDA) or M16-5 (DATA) - Body ground |
Always |
10 kΩ or higher |
D26-5 (RC0) or M16-4 (+5) - Body ground |
Always |
10 kΩ or higher |
*1 |
Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly)) |
*2 |
Front view of wire harness connector (to Door Control Receiver) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Reconnect the D25 and D26 certification ECU (smart key ECU assembly) connectors. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D26-5 (RC0) - D25-15 (E) |
Engine switch off, all doors closed and transmitter switch pressed |
4.5 to 5.5 V |
*1 |
Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
3. |
REPLACE DOOR CONTROL RECEIVER |
(a) Temporarily replace the door control receiver with a new one (See page
).
|
4. |
CHECK FOR DTC |
(a) Clear the DTC (See page ).
(b) Recheck for DTCs.
OK:
DTC B1242 is not output.
OK | ![]() |
END (DOOR CONTROL RECEIVER WAS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Installation
INSTALLATION
PROCEDURE
1. INSTALL INSTRUMENT PANEL WIRE ASSEMBLY
(a) Connect the vent hole connector of the instrument panel wire to the
front passenger airbag assembly.
Text in Illustration
*1
Vent Hol ...
Terminals Of Ecu
TERMINALS OF ECU
1. CHECK TIRE PRESSURE WARNING ECU
HINT:
Inspect the connectors from the back side while the connectors are connected.
(a) Disconnect the L14 tire pressure warning antenna and receiver connector.
(b) Measure the voltage according to the ...
Vehicle identification
- Vehicle identification number
The vehicle identification number (VIN) is the legal identifier for your vehicle.
This is the primary identification number for your Toyota. It is used in registering
the ownership of your vehicle.
This number is s ...