Lexus NX: SRS Warning Light does not Come ON
DESCRIPTION
Refer to "SRS Warning Light Remains ON"
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WIRING DIAGRAM
Refer to "SRS Warning Light Remains ON"
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CAUTION / NOTICE / HINT
NOTICE:
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After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
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When disconnecting and reconnecting the auxiliary battery
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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-
After replacing the airbag ECU assembly, refer to initialization.
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- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- When replacing the combination meter assembly, make sure to replace it with a new one.
PROCEDURE
| 1. | CHECK AUXILIARY BATTERY |
(a) Measure the auxiliary battery voltage with the power switch off.
Standard voltage:
11 to 14 V
HINT:
It may be possible to tell whether the auxiliary battery is discharged by operating the horn.
If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.
| NG | .gif) | REPLACE OR RECHARGE AUXILIARY BATTERY |
|
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| 2. | CHECK CONNECTION OF CONNECTOR |
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
(c) Check that the connector is properly connected to the combination meter assembly.
| The connector is not properly connected | | CONNECT CONNECTORS PROPERLY |
|
| 3. | CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BATTERY AND BODY GROUND) |
(a) Disconnect the connector from the combination meter assembly.
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| *a | Front view of wire harness connector (to Combination Meter Assembly) |
(b) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I10-21 (IG+) - Body ground | Power switch on (IG) | 11 to 14 V |
| I10-22 (B) - Body ground | Power switch off | 11 to 14 V |
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I10-40 (EP) - Body ground | Always | Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. | CHECK SRS WARNING LIGHT (SHORT TO GROUND) |
(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
(c) Connect the connector to the combination meter assembly.
(d) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
(e) Turn the power switch on (IG).
(f) Check the SRS warning light condition.
OK:
After the primary check period, the SRS warning light goes off for approximately 10 seconds and then remains on.
HINT:
The primary check period is approximately 6 seconds after the power switch is turned on (IG).
| OK | | REPLACE AIRBAG ECU ASSEMBLY |
| NG | | GO TO METER / GAUGE SYSTEM |
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On-vehicle Inspection
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