DESCRIPTION
The door lock receiver is used to receive electrical waves relating to the entry functions of the smart key system (for Entry Function). The certification ECU decodes the requested smart key system (for Entry Function) operation by identifying a key code based on the electric 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 through the certification ECU. The certification ECU then sends a command, according to the requested operation, to each ECU (ex.: if a door lock operation is requested, the certification ECU sends a door lock command to the main body ECU).
This DTC is stored when both of the following occurs: 1) a short from RDA or RSSI to ground between the certification ECU and the door control receiver, and 2) RCO output (5 V) from the ECU is off.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B1242 |
Both condition are met:
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU AND BODY GROUND) |
(a) Disconnect the O10 receiver connector.
(b) Disconnect the F79 and F78 ECU connectors.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
O10-2 (RSSI) - F78-16 (RSSI) |
Always |
Below 1 Ω |
O10-5 (DATA) - F78-15 (RDA) |
Always |
Below 1 Ω |
O10-4 (+5) - F78-5 (RCO) |
Always |
Below 1 Ω |
O10-1 (GND) - Body ground |
Always |
Below 1 Ω |
F79-15 (E) - Body ground |
Always |
Below 1 Ω |
O10-2 (RSSI) or F78-16 (RSSI) - Body ground |
Always |
10 kΩ or higher |
O10-5 (DATA) or F78-15 (RDA) - Body ground |
Always |
10 kΩ or higher |
O10-4 (+5) or F78-5 (RCO) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
CHECK CERTIFICATION ECU |
(a) Measure the voltage according to the value(s) in the table below.
*a |
Component with harness connected (Certification ECU) |
- |
- |
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
F78-5 (RCO) - F79-15 (E) |
Engine switch off, all doors closed and transmitter switch not pressed → pressed |
Below 1 V → 4.5 to 5.5 V |
NG | ![]() |
REPLACE CERTIFICATION ECU |
|
3. |
REPLACE DOOR CONTROL RECEIVER |
(a) Temporarily replace the door control receiver with a new or normally functioning
one (See page ).
|
4. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
5. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B1242 is not output.
OK | ![]() |
END (DOOR CONTROL RECEIVER IS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU |
Operating a USB memory
Connecting a USB memory enables you to enjoy music from the vehicle
speakers.
Connecting a USB memory
Pull up the lid.
Open the cover and connect a USB memory.
Turn on the power of the USB memory if it is not turned on.
Press
.
Control panel
S ...
Precaution
PRECAUTION
1. EXPRESSIONS OF IGNITION SWITCH
The type of ignition switch used on this model differs according to the specifications
of the vehicle.
The expressions listed in the table below are used in this section.
Expression
Ignit ...