| Last Modified: 08-21-2023 | 6.11:8.1.0 | Doc ID: RM100000001AR7Y |
| Model Year Start: 2019 | Model: Avalon HV | Prod Date Range: [04/2018 - ] |
| Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM (for HV Model): B1800-B1803; Short in D Squib Circuit; 2019 - 2022 MY Avalon HV [04/2018 - ] | ||
|
DTC |
B1800 |
Short in D Squib Circuit |
|
DTC |
B1801 |
Open in D Squib Circuit |
|
DTC |
B1802 |
Short in D Squib Circuit (to Ground) |
|
DTC |
B1803 |
Short in D Squib Circuit (to +B) |
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.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
Test Mode / Check Mode |
|---|---|---|---|---|---|
|
B1800 |
Short in D Squib Circuit |
|
|
Comes on |
Applies to check mode |
|
B1801 |
Open in D Squib Circuit |
|
|
Comes on |
Applies to check mode |
|
B1802 |
Short in D Squib Circuit (to Ground) |
|
|
Comes on |
Applies to check mode |
|
B1803 |
Short in D Squib Circuit (to +B) |
|
|
Comes on |
Applies to check mode |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
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.
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![2019 - 2022 MY Avalon Avalon HV [04/2018 - ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION](/t3Portal/stylegraphics/info.gif)
HINT:
-
Perform the simulation method by selecting check mode (Signal Check) using the Techstream.
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-
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 road or rough road.
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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 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.
| NG |
|
REPLACE WIRE HARNESS |
|
|
2. |
CHECK HORN BUTTON ASSEMBLY |
|
(a) Connect the instrument panel wire to the airbag ECU assembly and spiral cable sub-assembly. |
|
(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:
- Do not forcibly insert SST into the terminals of the connector when connecting it.
- 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.
Body Electrical > SRS Airbag > Clear DTCs
(f) Turn the power switch off.
(g) Turn the power switch on (IG), and wait for at least 60 seconds.
(h) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes
OK:
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 power switch off.
(j) 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.
(k) Disconnect SST from connector E.
| OK |
|
REPLACE HORN BUTTON ASSEMBLY
|
|
|
3. |
CHECK DRIVER SQUIB CIRCUIT |
|
(a) Disconnect the instrument panel wire from the airbag ECU assembly. |
|
(b) 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z5-2 (D+) - Body ground |
Power switch on (IG) |
Below 1 V |
|
z5-1 (D-) - Body ground |
Power switch on (IG) |
Below 1 V |
(4) Turn the power switch off.
(5) 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 for an open in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z5-2 (D+) - z5-1 (D-) |
Always |
Below 1 Ω |
(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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z5-2 (D+) - Body ground |
Always |
1 MΩ or higher |
|
z5-1 (D-) - Body ground |
Always |
1 MΩ or higher |
(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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z5-2 (D+) - z5-1 (D-) |
Always |
1 MΩ or higher |
(3) Restore the released activation prevention mechanism of connector B to the original condition.
| NG |
|
|
|
4. |
CHECK DTC |
|
(a) Connect the connectors to the horn button assembly and airbag ECU assembly. |
|
(b) Connect the cable to the negative (-) auxiliary battery terminal.
(c) Turn the power 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 power switch off.
(f) Turn the power switch on (IG), and wait for at least 60 seconds.
(g) Check for DTCs.
Body Electrical > SRS Airbag > Trouble Codes
OK:
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.
| OK |
|
| NG |
|
REPLACE AIRBAG ECU ASSEMBLY
|
|
5. |
CHECK INSTRUMENT PANEL WIRE |
|
(a) Disconnect the instrument panel wire from the spiral cable sub-assembly. |
|
(b) 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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G18-1 (D+) - Body ground |
Power switch on (IG) |
Below 1 V |
|
G18-2 (D-) - Body ground |
Power switch on (IG) |
Below 1 V |
(4) Turn the power switch off.
(5) 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 for an open in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G18-1 (D+) - G18-2 (D-) |
Always |
Below 1 Ω |
(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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G18-1 (D+) - Body ground |
Always |
1 MΩ or higher |
|
G18-2 (D-) - Body ground |
Always |
1 MΩ or higher |
(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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
G18-1 (D+) - G18-2 (D-) |
Always |
1 MΩ or higher |
(3) Restore the released activation prevention mechanism of connector B to the original condition.
| NG |
|
REPLACE INSTRUMENT PANEL WIRE |
|
|
6. |
CHECK SPIRAL CABLE 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:
(4) Turn the power switch off. (5) 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. |
|
(b) Check for an open in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z5-2 (D+) - z5-1 (D-) |
Always |
Below 1 Ω |
(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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z5-2 (D+) - Body ground |
Always |
1 MΩ or higher |
|
z5-1 (D-) - Body ground |
Always |
1 MΩ or higher |
(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:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
z5-2 (D+) - z5-1 (D-) |
Always |
1 MΩ or higher |
(3) Restore the released activation prevention mechanism of connector D to the original condition.
| OK |
|
| NG |
|
REPLACE SPIRAL CABLE SUB-ASSEMBLY
|
|
|