B1801
SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM:
DTC B1800/51 - Short in Driver Side Squib Circuit
DTC B1801/51 - Open in Driver Side Squib Circuit
DTC B1802/51 - Short to GND in Driver Side Squib Circuit
DTC B1803/51 - Short to B+ in Driver Side Squib Circuit
DESCRIPTION
The driver side squib circuit consists of the center airbag sensor, the spiral cable and the horn button.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the driver side squib circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK FOR DTC
(a) Proceed to each step according to DTC readings.
(1) If using the intelligent tester (read the 5-digit of DTC):
Using the intelligent tester, check for DTCs DTC Check / Clear.
Result
(2) If not using the intelligent tester (read the 2-digit of DTC):
Check for DTCs DTC Check / Clear.
Result
E -- CHECK CONNECTOR
D -- CHECK DRIVER SIDE SQUIB CIRCUIT (TO B+)
C -- CHECK DRIVER SIDE SQUIB CIRCUIT (TO GROUND)
B -- CHECK DRIVER SIDE SQUIB CIRCUIT (OPEN)
A -- Continue to next step.
2. CHECK CONNECTOR
(a) Check that the spiral cable connectors (on the horn button side) are not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- Continue to next step.
3. CHECK DRIVER SIDE SQUIB CIRCUIT (SHORT)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the center airbag sensor.
(d) Disconnect the connectors from the horn button.
(e) Release the activation prevention mechanism built into connector "B" Diagnosis System.
(f) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CHECK INSTRUMENT PANEL WIRE (SHORT)
OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
4. CHECK DRIVER SIDE SQUIB CIRCUIT (OPEN)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the center airbag sensor.
(d) Disconnect the connectors from the horn button.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CHECK INSTRUMENT PANEL WIRE (OPEN)
OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
5. CHECK DRIVER SIDE SQUIB CIRCUIT (TO GROUND)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the center airbag sensor.
(d) Disconnect the connectors from the horn button.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CHECK INSTRUMENT PANEL WIRE (TO GROUND)
OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
6. CHECK DRIVER SIDE SQUIB CIRCUIT (TO B+)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the center airbag sensor.
(d) Disconnect the connectors from the horn button.
(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(f) Turn the ignition switch to the ON position.
(g) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(h) Before proceeding to the next step, perform the following procedures.
(1) Turn the ignition switch to the LOCK position.
(2) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
NG -- CHECK INSTRUMENT PANEL WIRE (TO B+)
OK -- CHECK CENTER AIRBAG SENSOR ASSEMBLY
7. CHECK CONNECTOR
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check that the spiral cable connectors (on the horn button side) are not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- Continue to next step.
8. CHECK DRIVER SIDE SQUIB CIRCUIT
(a) Disconnect the connectors from the center airbag sensor.
(b) Disconnect the connectors from the horn button.
(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch to the ON position.
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(f) Turn the ignition switch to the LOCK position.
(g) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(i) Release the activation prevention mechanism built into connector "B" Diagnosis System.
(j) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CHECK INSTRUMENT PANEL WIRE
OK -- Continue to next step.
9. REPLACE HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB)
(a) Replace the horn button and connect the connectors.
HINT: Perform the inspection using parts from a normal vehicle if possible.
(b) Connect the connectors to the center airbag sensor.
(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory DTC Check / Clear.
(f) Turn the ignition switch to the LOCK position.
(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
OK:
DTC 51 is not output
HINT: Codes other than code 51 may be output at this time, but they are not related to this check.
NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- END
10. CHECK CENTER AIRBAG SENSOR ASSEMBLY
(a) Restore the released activation prevention mechanism of connector "B" to the original condition.
(b) Connect the connectors to the center airbag sensor.
(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory DTC Check / Clear.
(f) Turn the ignition switch to the LOCK position.
(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
OK:
DTC B1800 is not output.
HINT: Codes other than code B1800 may be output at this time, but they are not related to this check.
NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- CHECK HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB)
11. CHECK CENTER AIRBAG SENSOR ASSEMBLY
(a) Connect the connectors to the center airbag sensor.
(b) Using a service wire, connect D+ and D- of connector "E".
NOTICE:
- Twist the end of the service wire in order to insert it into the connector.
- Do not forcibly insert the twisted service wire into the terminals of the connector when connecting.
(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch on the ON position, and wait for at least 60 seconds.
(e) Clear the DTCs stored in memory DTC Check / Clear.
(f) Turn the ignition switch to the LOCK position.
(g) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
OK:
DTC B1801, B1802 or B1803 is not output.
HINT: Codes other than code B1801, B1802 or B1803 may be output at this time, but they are not related to this check.
(i) Before proceeding to the next step, perform the following procedures.
(1) Disconnect the service wire from connector "E".
NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- Continue to next step.
12. CHECK HORN BUTTON ASSEMBLY (DRIVER SIDE SQUIB)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Connect the connectors to the horn button.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(f) Clear the DTCs stored in memory DTC Check / Clear.
(g) Turn the ignition switch to the LOCK position.
(h) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(i) Check for DTCs DTC Check / Clear.
OK:
DTC B1800, B1801, B1802 or B1803 is not output.
HINT: Codes other than code B1800, B1801, B1802 or B1803 may be output at this time, but they are not related to this check.
NG -- REPLACE HORN BUTTON ASSEMBLY
OK -- PERFORM SYMPTOM SIMULATION
13. CHECK INSTRUMENT PANEL WIRE (SHORT)
(a) Disconnect the instrument panel wire connector from the spiral cable.
HINT: The activation prevention mechanism of connector "B" has already been released.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
14. CHECK SPIRAL CABLE SUB-ASSEMBLY (SHORT)
(a) Release the activation prevention mechanism built into connector "D" Diagnosis System.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- PERFORM SYMPTOM SIMULATION
15. CHECK INSTRUMENT PANEL WIRE (OPEN)
(a) Disconnect the instrument panel wire connector from the spiral cable.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
16. CHECK SPIRAL CABLE SUB-ASSEMBLY (OPEN)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- PERFORM SYMPTOM SIMULATION
17. CHECK INSTRUMENT PANEL WIRE (TO GROUND)
(a) Disconnect the instrument panel wire connector from the spiral cable.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
18. CHECK SPIRAL CABLE SUB-ASSEMBLY (TO GROUND)
(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- PERFORM SYMPTOM SIMULATION
19. CHECK INSTRUMENT PANEL WIRE (TO B+)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the instrument panel wire connector from the spiral cable.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the ignition switch to the ON position.
(f) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
20. CHECK SPIRAL CABLE SUB-ASSEMBLY (TO B+)
(a) Measure the resistance according to the value(s) in the table below.
Standard voltage:
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- PERFORM SYMPTOM SIMULATION
21. CHECK INSTRUMENT PANEL WIRE
(a) Restore the released activation prevention mechanism of connector "B" to the original condition.
(b) Disconnect the instrument panel wire connector from the spiral cable.
(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(d) Turn the ignition switch to the ON position.
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(f) Turn the ignition switch to the LOCK position.
(g) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(i) Release the activation prevention mechanism built into connector "B" Diagnosis System.
(j) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
22. CHECK SPIRAL CABLE SUB-ASSEMBLY
(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
(d) Turn the ignition switch to the LOCK position.
(e) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(f) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(g) Release the activation prevention mechanism built into connector "D" Diagnosis System.
(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE SPIRAL CABLE SUB-ASSEMBLY
OK -- PERFORM SYMPTOM SIMULATION