DESCRIPTION The driver squib circuit consists of the airbag ECU assembly, spiral cable sub-assembly and horn button assembly. The airbag ECU assembly uses this circuit to deploy the airbag when deployment conditions are met. These DTCs are stored when a malfunction is detected in the driver squib circuit.
WIRING DIAGRAM  CAUTION / NOTICE / HINT NOTICE: After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work. Click here
HINT:
PROCEDURE
(b) Disconnect the cable from the negative (-) battery terminal. CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. (c) Check that the connectors are properly connected to the horn button assembly, spiral cable sub-assembly and airbag ECU 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 cable sub-assembly and airbag ECU 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 cable sub-assembly connector (on the horn button assembly side) is not loose, deformed or damaged. OK: The airbag 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 cable sub-assembly connector are not deformed or damaged. OK: The short springs are not deformed or damaged.
(b) Connect SST (resistance 2.1 Ω) to connector E (light green connector). CAUTION: Never connect a 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. (d) Turn the engine switch on (IG), and wait for at least 60 seconds. (e) Clear the DTCs stored in memory. Body Electrical > SRS Airbag > Clear DTCs(f) Turn the engine switch off. (g) Turn the engine switch on (IG), and wait for at least 60 seconds. (h) Check for DTCs. Body Electrical > SRS Airbag > Trouble CodesOK: DTC B1800, B1801, B1802 or B1803 is not output. HINT: Codes other than DTCs B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check. (i) Turn the engine switch off. (j) Disconnect the cable from the negative (-) battery terminal. CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. (k) Disconnect SST from connector E.
(b) Check for a short to B+ in the circuit. (1) Connect the cable to the negative (-) battery terminal. (2) Turn the engine switch on (IG). (3) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(4) Turn the engine switch off. (5) Disconnect the cable from the negative (-) battery terminal. CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. (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. (c) Turn the engine switch on (IG), and wait for at least 60 seconds. (d) Clear the DTCs stored in memory. Body Electrical > SRS Airbag > Clear DTCs(e) Turn the engine switch off. (f) Turn the engine switch on (IG), and wait for at least 60 seconds. (g) Check for DTCs. Body Electrical > SRS Airbag > Trouble CodesOK: DTC B1800, B1801, B1802 or B1803 is not output. HINT: Codes other than DTCs B1800, B1801, B1802 and B1803 may be output at this time, but they are not related to this check.
(b) Check for a short to B+ in the circuit. (1) Connect the cable to the negative (-) battery terminal. (2) Turn the engine switch on (IG). (3) Measure the voltage according to the value(s) in the table below. Standard Voltage:
(4) Turn the engine switch off. (5) Disconnect the cable from the negative (-) battery terminal. CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. (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) Check for an open in the circuit. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(c) Check for a short to ground in the circuit. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance:
(d) Check for a short in the circuit. (1) Release the activation prevention mechanism built into connector D. 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 D to the original condition.
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Idle Control System (P050500)
DESCRIPTION The idle speed is controlled by the ETCS (Electronic Throttle Control System). The ETCS is comprised of: 1) the one valve type throttle body; 2) the throttle actuator, which operates the throttle valve; 3) the throttle position sensor, which detects the opening angle of the throttle valv ...
