B2036

PRE-COLLISION SYSTEM: B2036: Power Supply Relay Malfunction Open

DTC B2036 - Power Supply Relay Malfunction Open

DESCRIPTION

If the seat belt control ECU judges that there is a malfunction in its internal circuit as a result of self-diagnosis, or if the power source voltage (+B) is not input to the seat belt control ECU, this DTC will be stored.






INSPECTION PROCEDURE
NOTE:
The pretensioner is built into the front seat outer belt assembly. Be sure to follow the correct inspection procedure, as failure to follow the correct procedure (such as inspection of incorrect connectors) may deploy the pretensioner.

PROCEDURE

1. INSPECT FUSIBLE LINK (PSB FUSE)




(a) Remove the fusible link from the engine room R/B.




(b) Check if the fusible link is melted.
OK:
The fusible link is melted.
(c) Install the fusible link to the engine room R/B with the nut.
Torque: 5.4 Nm (55 kgf-cm, 48 in-lbf)
NG -- REPLACE FUSIBLE LINK (PSB FUSE)
OK -- Continue to next step.
2. INSPECT SEAT BELT CONTROL ECU (+B TERMINAL VOLTAGE)




(a) Disconnect the negative (-) battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
(b) Disconnect the M21 connector of the seat belt control ECU.
(c) Connect the negative (-) battery terminal.
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:





(e) Disconnect the negative (-) battery terminal.
(f) Reconnect the M21 seat belt control ECU connector.
(g) Connect the negative (-) battery terminal.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE SEAT BELT CONTROL ECU