Last Modified: 07-31-2024 |
6.11:8.1.0 |
Doc ID: RM100000001HWD4 |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [03/2019 - 09/2022] |
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM (for Gasoline Model, with Smart Key System): B1242; Wireless Door Lock Tuner Circuit Malfunction; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [03/2019 - 09/2022] |
DTC
|
B1242
|
Wireless Door Lock Tuner Circuit Malfunction
|
DESCRIPTION
The door control receiver is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly 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 electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network body ECU) through the certification ECU (smart key ECU assembly). (ex. If a door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (multiplex network body ECU)).
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
B1242
|
Wireless Door Lock Tuner Circuit Malfunction
|
-
Short to ground in RDAM terminal circuit between the certification ECU (smart key ECU assembly) and door control receiver.
-
Short to ground in RDAM terminal circuit when voltage (5 V) is not being output from terminal RCO
|
-
Wire harness or connector
-
Door control receiver
-
Certification ECU (smart key ECU assembly)
|
WIRING DIAGRAM
for 12 Pin Type
for 5 Pin Type
CAUTION / NOTICE / HINT
PROCEDURE
1.
|
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
(a) Disconnect the O18*1 or O38*2 door control receiver connector.
-
*1: for 12 Pin Type
-
*2: for 5 Pin Type
(b) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
*a
|
Component with harness connected
(Certification ECU (Smart Key ECU Assembly))
|
-
|
-
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I1-18 (E) - Body ground
|
Always
|
Below 1 Ω
|
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
O61-21 (RDAM) - I1-18 (E)
|
Always
|
11 to 14 V
|
O61-18 (RCO) - I1-18 (E)
|
Always
|
Below 1 V → 4.5 to 5.5 V pulse generation at regular intervals
|
Result
|
Proceed to
|
OK (for 12 Pin Type)
|
A
|
OK (for 5 Pin Type)
|
B
|
NG
|
C
|
A |
|
REPLACE ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY
for Hatchback: Click here
for Sedan: Click here
|
C
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
|
(a) Disconnect the O61 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for 12 Pin Type
Tester Connection
|
Condition
|
Specified Condition
|
O61-21 (RDAM) - O18-2 (DATA)
|
Always
|
Below 1 Ω
|
O61-18 (RCO) - O18-8 (+5)
|
Always
|
Below 1 Ω
|
O18-12 (GND) - Body ground
|
Always
|
Below 1 Ω
|
O18-2 (DATA) or O61-21 (RDAM) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
O18-8 (+5) or O61-18 (RCO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
for 5 Pin Type
Tester Connection
|
Condition
|
Specified Condition
|
O61-21 (RDAM) - O38-5 (DATA)
|
Always
|
Below 1 Ω
|
O61-18 (RCO) - O38-4 (+5)
|
Always
|
Below 1 Ω
|
O38-1 (GND) - Body ground
|
Always
|
Below 1 Ω
|
O61-21 (RDAM) or O38-5 (DATA) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
O61-18 (RCO) or O38-4 (+5) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|