WIRELESS DOOR LOCK CONTROL SYSTEM, Diagnostic DTC:B1242
| DTC Code | DTC Name |
|---|---|
| B1242 | Wireless Door Lock Tuner Circuit Malfunction |
DESCRIPTION
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The electrical key antenna and the door control receiver are used to receive electric waves relating to the entry functions of the entry and start system. The certification ECU (smart key ECU assembly) decodes the requested entry and start system operation by identifying a key code based on electric waves received via the electrical key antenna and the door control receiver.
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The door control receiver receives a signal from the wireless door control transmitter and sends signals to the main body ECU RH (cowl side junction block RH) through the certification ECU (smart key ECU assembly).
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The certification ECU (smart key ECU assembly) then sends a command, according to the requested operation, to each ECU (e.g. If door lock operation is requested, the ECU sends a door lock command to the main body ECU RH (cowl side junction block RH)).
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| B1242 | The certification ECU (smart key ECU assembly) detects that there is a short in the circuit between terminals RSSI, or between terminals DATA and RDA. |
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WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
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CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - DOOR CONTROL RECEIVER)
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Disconnect the P33 certification ECU (smart key ECU assembly) connector and P31 door control receiver connector.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance Tester Connection Condition Specified Condition P33-39 (RSSI) - P31-5 (RSSI) Always Below 1 Ω P33-38 (RDA) - P31-3 (DATA) Always Below 1 Ω P33-39 (RSSI) - P33-38 (RDA) Always 10 kΩ or higher P33-39 (RSSI) - Body ground Always 10 kΩ or higher P33-38 (RDA) - Body ground Always 10 kΩ or higher
NG 
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK 
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INSPECT CERTIFICATION ECU
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Reconnect the P33 ECU connector.
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Measure the voltage according to the value(s) in the table below.
Standard Voltage Tester Connection Condition Specified Condition P33-39 (RSSI) - P33-17 (E) Engine switch OFF, all doors closed, the electrical key not in the actuation area 11 to 14 V Engine switch OFF, all doors closed, the electrical key in the actuation area Below 1 V P33-38 (RDA) - P33-17 (E) Engine switch OFF, all doors closed, transmitter switch not pressed 11 to 14 V Engine switch OFF, all doors closed, transmitter switch pressed Below 1 V
NG
REPLACE CERTIFICATION ECU
OK 
REPLACE DOOR CONTROL RECEIVER
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