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.
Text in Illustration
*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 |
Disposal
DISPOSAL
CAUTION / NOTICE / HINT
CAUTION:
Before performing pre-disposal deployment of any SRS part, review and closely
follow all applicable environmental and hazardous material regulations. Pre-disposal
deployment may be considered hazardous material ...
Output Speed Sensor Circuit No Signal (P0722)
DESCRIPTION
The speed sensor SP2 detects the rotation speed of the transmission output shaft
and sends signals to the ECM. The ECM determines the vehicle speed based on these
signals. An AC voltage is generated in the speed sensor SP2 coil as the parking ...