- Short in RDA or RSSI to ground between the certification ECU (smart key ECU assembly) and the door control receiver.
- Short in RDA or RSSI to ground when RCO (5 V) output from the ECU is off.
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VJH1 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - ] |
| Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM(w/ Smart Key System): B1242; Wireless Door Lock Tuner Circuit Malfunction; 2016 - 2020 MY Sienna [12/2015 - ] | ||
|
DTC |
B1242 |
Wireless Door Lock Tuner Circuit Malfunction |
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 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 (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).
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B1242 |
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- When replacing or inspecting the door control receiver and wire harness, do not change the position or length of the wire harness. If the wire harness is too close to the door control receiver, entry and wireless function performance may be affected.
- Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (DOOR CONTROL RECEIVER - CERTIFICATION ECU AND BODY GROUND) |
(a) Disconnect the D87 and D88 certification ECU (smart key ECU assembly) connectors.
(b) Disconnect the L27 door control receiver connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D87-16 (RSSI) - L27-2 (RSSI) |
Always |
Below 1 Ω |
|
D87-15 (RDA) - L27-5 (DATA) |
Always |
Below 1 Ω |
|
D87-5 (RCO) - L27-4 (+5) |
Always |
Below 1 Ω |
|
D88-15 (E) - Body ground |
Always |
Below 1 Ω |
|
L27-1 (GND) - Body ground |
Always |
Below 1 Ω |
|
D87-16 (RSSI) or L27-2 (RSSI) - Body ground |
Always |
10 kΩ or higher |
|
D87-15 (RDA) or L27-5 (DATA) - Body ground |
Always |
10 kΩ or higher |
|
D87-5 (RCO) or L27-4 (+5) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
2. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
|
(a) Reconnect the D87 and D88 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 |
|---|---|---|
|
D87-5 (RCO) - D88-15 (E) |
Engine switch off, all doors closed and transmitter switch pressed |
4.5 to 5.5 V |
Text in Illustration
|
*a |
Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
| NG |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (See page
|
|
|
3. |
REPLACE DOOR CONTROL RECEIVER |
(a) Temporarily replace the door control receiver with a new one (See page
![2016 - 2020 MY Sienna [12/2015 - ]; DOOR LOCK: DOOR CONTROL RECEIVER: REMOVAL](/t3Portal/stylegraphics/info.gif)
).
|
|
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) (See page
|
|
|