B1803
SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1800/51-B1803/51: Short in Driver Side Squib Circuit
B1803/51 - Short to B+ in Driver Side Squib Circuit
DESCRIPTION
* The driver side squib circuit consists of the airbag sensor assembly, spiral cable with sensor sub-assembly and horn button assembly.
* The airbag sensor 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 side squib circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Service Precautions.
HINT
* Perform the simulation method by selecting check mode (Signal Check) using the Techstream Check Mode Procedure.
* After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city or rough road How To Proceed With Troubleshooting.
PROCEDURE
1. CHECK CONNECTORS
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
(c) Check that the connectors are properly connected to the horn button assembly, spiral cable with sensor sub-assembly and airbag sensor assembly.
OK:
The connectors are properly connected.
HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.
(d) Disconnect the connectors from the horn button assembly, spiral cable with sensor sub-assembly and airbag sensor assembly.
(e) Check that the terminals of the connectors are not damaged.
OK:
The terminals are not deformed or damaged.
(f) Check that the spiral cable with sensor sub-assembly connector (on the horn button assembly side) is not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
(g) Check that the short springs for the instrument panel wire and spiral cable with sensor sub-assembly with the activation prevention mechanism are not deformed or damaged.
OK:
The short springs are not deformed or damaged.
Text in Illustration
NG -- REPLACE WIRE HARNESS
OK -- Continue to next step.
2. CHECK HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB)
(a) Connect the instrument panel wire to the airbag sensor assembly and spiral cable with sensor sub-assembly.
(b) Connect SST (resistance 2.1 Ohms) to connector E (orange connector).
CAUTION:
Never connect the tester to the horn button assembly (driver side squib) for measurement, as this may lead to a serious injury due to airbag deployment.
NOTICE:
* Do not forcibly insert SST into the terminals of the connector when connecting.
* Insert SST straight into the terminals of the connector.
SST : 09843-18061
(c) Connect the cable to the negative (-) auxiliary battery terminal.
(d) Turn the power switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.
(f) Turn the power switch off.
(g) Turn the power switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.
Text in Illustration
HINT
Codes other than DTCs B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.
NG -- CHECK DRIVER SIDE SQUIB CIRCUIT
OK -- REPLACE HORN BUTTON ASSEMBLY Removal
3. CHECK DRIVER SIDE SQUIB CIRCUIT
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
(c) Disconnect SST from connector E.
(d) Disconnect the instrument panel wire from the airbag sensor assembly.
(e) Check for a short to B+ in the circuit.
(1) Connect the cable to the negative (-) auxiliary battery terminal.
(2) Turn the power switch on (IG).
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(f) Check for an open in the circuit.
(1) Turn the power switch off.
(2) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(g) Check for a short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(h) Check for a short in the circuit.
(1) Release the activation prevention mechanism built into connector B Diagnosis System.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK INSTRUMENT PANEL WIRE
OK -- Continue to next step.
4. CHECK AIRBAG SENSOR ASSEMBLY
(a) Restore the released activation prevention mechanism of connector B to the original condition.
(b) Connect the connectors to the horn button assembly and airbag sensor assembly.
(c) Connect the cable to the negative (-) auxiliary battery terminal.
(d) Turn the power switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.
(f) Turn the power switch off.
(g) Turn the power switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC B1800/51, B1801/51, B1802/51 or B1803/51 is not output.
Text in Illustration
HINT
Codes other than DTCs B1800/51, B1801/51, B1802/51 and B1803/51 may be output at this time, but they are not related to this check.
NG -- REPLACE AIRBAG SENSOR ASSEMBLY Removal
OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
5. CHECK INSTRUMENT PANEL WIRE
(a) Restore the released activation prevention mechanism of connector B to the original condition.
(b) Disconnect the instrument panel wire from the spiral cable with sensor sub-assembly.
(c) Check for a short to B+ in the circuit.
(1) Connect the cable to the negative (-) auxiliary battery terminal.
(2) Turn the power switch on (IG).
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(d) Check for an open in the circuit.
(1) Turn the power switch off.
(2) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(e) Check for a short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(f) Check for a short in the circuit.
(1) Release the activation prevention mechanism built into connector B Diagnosis System.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
6. CHECK SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY
(a) Check for a short to B+ in the circuit.
(1) Connect the cable to the negative (-) auxiliary battery terminal.
(2) Turn the power switch on (IG).
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(b) Check for an open in the circuit.
(1) Turn the power switch off.
(2) Disconnect the cable from the negative (-) auxiliary battery terminal.
CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.
(3) 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 Diagnosis System.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY Removal
OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting