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) |
Parts Location
PARTS LOCATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
ILLUSTRATION
...
Precaution
PRECAUTION
1. NOTICE FOR INITIALIZATION
HINT:
When disconnecting the cable from the negative (-) battery terminal, initialize
the following systems after the cable is reconnected.
System Name
See procedure
Back Door ...
Operation Check
OPERATION CHECK
1. CHECK FUNCTION
(a) Check that the key reminder warning buzzer sounds.
(1) With the driver side door closed, insert the key into the ignition key cylinder
and then make sure that the key is in LOCK or ACC.
(2) Check that the buzzer soun ...