Toyota Sienna Service Manual: Terminals of ecu
Check tire pressure warning ecu
HINT: Inspect the connectors from the back side while the connectors are connected.
(a) Disconnect the tire pressure warning antenna and receiver connector.
(b) Measure the voltage according to the value(s) in the table below.
(c) Connect the tire pressure warning antenna and receiver connector.
(d) Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may have a malfunction.
(e) Using an oscilloscope, check the waveform 1.
(1) Waveform 1 (Reference)
(2) Waveform 2 (Reference)
Problem symptoms table
HINT:
Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected Area"
column ...
Diagnosis system
1. CHECK BATTERY VOLTAGE
Standard voltage:
11 to 14 V
If the voltage is below 11 V, recharge the battery before
proceeding.
2. CHECK DLC3
(a) The ECU uses the ISO 15765-4 for communication
pr ...
Other materials:
Rear Occupant Classification Sensor RH Collision
Detection
DTC B1788 Rear Occupant Classification Sensor RH Collision
Detection
DESCRIPTION
DTC B1788 is output when the occupant classification ECU receives a collision
detection signal sent by
the rear occupant classification sensor RH if an accident occurs.
DTC B1788 is also output when the front s ...
Combination Meter ECU Communication Stop
DTC B1271 Combination Meter ECU Communication Stop
DESCRIPTION
DTC B1271 is output when communication between the combination meter and the
multiplex network
gateway ECU stops for more than 10 seconds.
DTC No.
DTC Detection Condition
Trouble Area
B1271
...
Short to GND in Driver Side Squib 2nd Step Circuit
DTC B1182/19 Short to GND in Driver Side Squib 2nd Step Circuit
DESCRIPTION
The driver side squib 2nd step circuit consists of the center airbag sensor
assembly, the spiral cable and
the steering pad.
The circuit instructs the SRS to deploy when deployment conditions are met.
DTC B1182/19 ...
