B1801
SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1800/51-B1803/51: Short in Driver Side Squib Circuit
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 assembly, the spiral cable and the steering pad.
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
HINT:
- Perform the simulation method by selecting the "check mode" (signal check) with Techstream Check Mode Procedure.
- After selecting the "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 Diagnosis System.
PROCEDURE
1. CHECK CONNECTORS
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the steering pad, spiral cable and center 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 steering pad, spiral cable and center airbag sensor assembly.
(e) Check that the connectors of the terminals are not damaged.
OK:
The terminals are not deformed or damaged.
(f) Check that the spiral cable connector (on the steering pad side) is not damaged.
OK:
The lock button is not disengaged, and the claw of the lock is not deformed and damaged.
NG -- REPLACE WIRE HARNESS
OK -- Continue to next step.
2. CHECK STEERING PAD (DRIVER SIDE SQUIB)
(a) Connect the instrument panel wire to the center airbag sensor assembly and spiral cable.
(b) Connect SST (resistance 2.1 Ohms) to connector E (orange connector).
CAUTION: Never connect the tester to the steering pad (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 negative (-) terminal cable to the battery.
(d) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory DTC Check / Clear.
(f) Turn the ignition switch off.
(g) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
OK:
DTC B1800, B1801, B1802, B1803, or 51 is not output.
HINT: Codes other than DTC B1800, B1801, B1802, B1803, and 51 may be output at this time, but they are not related to this check.
NG -- CHECK DRIVER SIDE SQUIB CIRCUIT
OK -- REPLACE STEERING PAD
3. CHECK DRIVER SIDE SQUIB CIRCUIT
(a) Turn the ignition switch off.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect SST from connector E.
(d) Disconnect the instrument panel wire from center airbag sensor assembly.
(e) Check for a short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery.
(2) Turn the ignition 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 ignition switch off.
(2) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(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:
NG -- CHECK INSTRUMENT PANEL WIRE
OK -- Continue to next step.
4. 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 steering pad and the center airbag sensor assembly.
(c) Connect the negative (-) terminal cable to the battery.
(d) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(e) Clear the DTCs stored in the memory DTC Check / Clear.
(f) Turn the ignition switch off.
(g) Turn the ignition switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs DTC Check / Clear.
OK:
DTC B1800, B1801, B1802, B1803, or 51 is not output.
HINT: Codes other than DTC B1800, B1801, B1802, B1803, and 51 may be output at this time, but they are not related to this check.
NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
OK -- USE SIMULATION METHOD TO CHECK
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.
(c) Check for a short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery.
(2) Turn the ignition 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 ignition switch off.
(2) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(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:
NG -- REPLACE INSTRUMENT PANEL WIRE
OK -- Continue to next step.
6. CHECK SPIRAL CABLE
(a) Check for a short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery.
(2) Turn the ignition 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 ignition switch off.
(2) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(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:
NG -- REPLACE SPIRAL CABLE
OK -- USE SIMULATION METHOD TO CHECK