Toyota Corolla Repair Manual: Inspection procedure
1 Check front airbag sensor (rh) circuit (to b+)(airbag sensor assy
center – airbag front rh sensor)

- Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
- disconnect the connectors between the airbag front rh
sensor and the airbag sensor assy center.
- connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
- turn the ignition switch to on.
- for the connector (on the airbag sensor assy center side)
between the airbag front rh sensor and the airbag sensor
assy center, measure the voltage between body
ground and each of +sr and –sr.
Ok:
voltage: below 1 v


2 Check front airbag sensor (rh) circuit (to ground)(airbag sensor
assy – airbag front rh sensor)

- Turn the ignition switch to lock.
- disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
- for the connector (on the airbag sensor assy center side)
between the airbag front rh sensor and the airbag sensor
assy center, measure the resistance between body
ground and each of +sr and –sr.
Ok:
resistance: 1 mΩ or higher


3 Check front airbag sensor (rh) circuit(open)(airbag sensor assy
center – airbag front rh sensor)
Sst 09843–18040

- Using a service wire, connect +sr and –sr of the connector
(on the airbag front rh sensor side) between the
airbag front rh sensor and the airbag sensor assy center.
- for the connector (on the airbag sensor assy center side)
between the airbag front rh sensor and the airbag sensor
assy center, measure the resistance between +sr
and –sr.
Ok:
resistance: below 1 Ω


4 Inspect air bag front rh sensor

- For the connector of the airbag front rh sensor, measure
the resistance between +sr and –sr.
Ok:
resistance: 820 Ω


5 Check air bag sensor assy center
Sst 09843–18040

- Disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
- connect the airbag front rh sensor connector and airbag
sensor assy center connector.
- connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
- turn the ignition switch to on, and wait at least for 20 seconds.
- clear the dtc stored in memory .
- turn the ignition switch to lock, and wait at least for 20
seconds.
- turn the ignition switch to on, and wait at least for 20 seconds.
- check the dtc .
Ok:
dtc b1156/b1157/15 is not output.
Hint
:
codes other than code b1156/b1157/15 may be output at this
time, but they are not relevant to this check.


Use simulation method to check
6 Check engine room main wire harness (to b+)(connector – airbag
front rh sensor)

- Turn the ignition switch to lock.
- disconnect the negative (–) terminal cable from the battery,
and wait at least for 90 seconds.
- disconnect the connector between the engine room main
wire and the instrument panel wire.
- connect the negative (–) terminal cable to the battery,
and wait at least for 2 seconds.
- turn the ignition switch to on.
- for the engine room main wire connector (on the airbag
sensor assy center side) between the airbag sensor assy
center and the airbag front rh sensor, measure the voltage
between body ground and each of +sr and –sr.
Ok:
voltage: below 1 v


Repair or replace instrument panel wire
7 Check engine room main wire harness (to ground)(connector –
airbag front rh sensor)

- Disconnect the connectors between the engine room
main wire and the instrument panel wire.
- for the engine room main wire connector (on the airbag
sensor assy center side) between the airbag sensor assy
center and the airbag front rh sensor, measure the resistance
between body ground and each of +sr and –sr.
Ok:
resistance: 1 mΩ or higher


Repair or replace instrument panel wire
8 Check engine room main wire harness(open)(connector – airbag
front rh sensor)
Sst 09843–18040

- Disconnect the connectors between the engine room
main wire and the instrument panel wire.
- using a service wire, connect +sr and –sr of the engine
room main wire connector (on the airbag front rh sensor
side) between the airbag sensor assy center and the airbag
front rh sensor.
- for the engine room main wire connector (on the airbag
sensor assy center side) between the airbag sensor assy
center and the airbag front rh sensor, measure the resistance
between the +sr and –sr.
Ok:
resistance: below 1 Ω


Repair or replace instrument panel wire
The airbag front rh sensor circuit consists of the airbag sensor assy center
and airbag front rh sensor.
Dtc b1156/b1157/15 is recorded when a malfunction is detected in the airbag
front rh sen ...
Dtc b1158/16 front airbag sensor (lh)
malfunction
Dtc b1159/16 front airbag sensor (lh)
malfunction ...
Other materials:
System description
The ecm uses signals from the vehicle speed sensor and crankshaft position
sensor to detect the actual
gear position (1st, 2nd, 3rd or o/d gear).
Then the ecm compares the actual gear with the shift schedule in the ecm memory
to detect the mechanical
trouble of the shift solenoid valves, th ...
Inspection procedure
1 Check ignition or starter switch assy
Check the ignition switch, as shown in the illustration and
table.
Standard:
2 Check fuse (ecu–b)
Remove the fuse from the instrument panel j/b.
check the continuity of the fuse.
Standard: continuity
3 Check relay (mar ...
Circuit description
When a misfire occurs in the engine, hydrocarbons (hc) enter the exhaust in
high concentrations. If this hc
concentration is high enough, there could be an increase in exhaust emissions
levels. High concentrations
of hc passing through the catalyst also cause to temperature of the catalyst to ...
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