DESCRIPTION The driver side squib circuit consists of the airbag sensor assembly, spiral with sensor cable sub-assembly and horn button assembly. The circuit instructs the SRS to deploy when deployment conditions are met. These DTCs are stored when a malfunction is detected in the driver side squib circuit.
WIRING DIAGRAM 
CAUTION / NOTICE / HINT NOTICE:
HINT: To perform the simulation method, enter check mode (signal check) with the Techstream
(Click here PROCEDURE
(b) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. (c) Check that the connectors are properly connected to the horn button assembly, spiral with sensor cable sub-assembly and airbag sensor assembly. OK: The connectors are properly connected. HINT: If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection. (d) Disconnect the connectors from the horn button assembly, spiral with sensor cable sub-assembly and airbag sensor assembly. (e) Check that the terminals of the connectors are not deformed or damaged. OK: The terminals are not deformed or damaged. (f) Check that the spiral with sensor cable sub-assembly connector (on the horn button assembly side) is not loose, deformed or damaged. OK: The connector locking button is not disengaged, and the claw of the lock is not deformed or damaged. (g) Check that the short springs of the activation prevention mechanisms of the instrument panel wire connector and spiral with sensor cable sub-assembly connector are not deformed or damaged. OK: The short springs are not deformed or damaged.
(b) Connect the white wire side of SST (resistance: 2.1 Ω) to connector E (orange connector). CAUTION: Never connect the tester to the horn button assembly for measurement, as this may lead to a serious injury due to airbag deployment. NOTICE:
SST: 09843-18061 (c) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. (d) Turn the ignition switch to ON, and wait for at least 60 seconds. (e) Clear the DTCs. Click here (f) Turn the ignition switch off. (g) Turn the ignition switch to ON, and wait for at least 60 seconds. (h) Check for DTCs. Click here
HINT: Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check. (i) Turn the ignition switch off. (j) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. (k) Disconnect SST from connector E.
(a) Disconnect the instrument panel wire from the airbag sensor assembly. 
(b) Check for a short to B+ in the circuit. (1) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. (2) Turn the ignition switch to ON. (3) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(4) Turn the ignition switch off. (5) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. (c) Check for an open in the circuit. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(d) Check for a short to ground in the circuit. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(e) Check for a short in the circuit. (1) Release the activation prevention mechanism built into connector B. Click here (2) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(3) Restore the released activation prevention mechanism of connector B to the original condition.
(b) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. (c) Turn the ignition switch to ON, and wait for at least 60 seconds. (d) Clear the DTCs. Click here (e) Turn the ignition switch off. (f) Turn the ignition switch to ON, and wait for at least 60 seconds. (g) Check for DTCs. Click here
HINT: Codes other than DTC B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.
(a) Disconnect the instrument panel wire from the spiral with sensor cable sub-assembly. 
(b) Check for a short to B+ in the circuit. (1) Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds. (2) Turn the ignition switch to ON. (3) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(4) Turn the ignition switch off. (5) Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds. (c) Check for an open in the circuit. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(d) Check for a short to ground in the circuit. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(e) Check for a short in the circuit. (1) Release the activation prevention mechanism built into connector B. Click here (2) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(3) Restore the released activation prevention mechanism of connector B to the original condition.
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Toyota Tundra Service Manual > Emission Control System: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT FUEL CUT-OFF OPERATION (a) Start and warm up the engine. (b) Open the throttle valve and keep the engine speed at 3000 rpm. (c) Use a sound scope to check for injector operating noise. (d) Check that when the accelerator pedal is released, injector operatio ...
