Smoke Sensor Circuit

AIR CONDITIONING: AIR CONDITIONING SYSTEM: Smoke Sensor Circuit
- Smoke Sensor Circuit

DESCRIPTION

This sensor detects the smoke level inside the cabin and sends the appropriate signals to the rear junction block ECU.

HINT
This circuit uses the CAN communication line. Before performing the inspection, check that the CAN communication system is functioning normally.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT FUSE (RR-IG1-2)

(a) Remove the RR-IG1-2 fuse from the luggage room junction block.

(b) Measure the resistance of the fuse.

Standard resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

2. CHECK REAR JUNCTION BLOCK ECU (SMOKE VOLTAGE)





(a) Remove the rear junction block ECU with connectors still connected.

(b) Measure the voltage according to the value(s) in the table below when applying or not applying cigarette smoke.

Standard voltage:





OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Symptom Related Diagnostic Procedures
NG -- Continue to next step.

3. INSPECT SMOKE SENSOR





(a) Remove the smoke sensor Disassembly.

(b) Connect the positive (+) lead from the battery to terminal 3 and negative (-) lead to terminal 1.

(c) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NOTICE:
Since the sensor determines the amount of smoke based on the changes in the amount of light, check the sensor in an area with as little ambient light as possible.

NG -- REPLACE SMOKE SENSOR Disassembly
OK -- Continue to next step.

4. CHECK HARNESS AND CONNECTOR (REAR JUNCTION BLOCK ECU - REAR AIR CONDITIONING HARNESS)





(a) Disconnect the S62 rear junction block ECU connector.

(b) Disconnect the S28 rear air conditioning harness connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

5. REPLACE REAR AIR CONDITIONING HARNESS

HINT
Replace the rear air conditioning harness with a normal one and check that the condition returns to normal Disassembly.

OK:

Same problem does not occur.

NG -- REPLACE REAR JUNCTION BLOCK ECU

OK -- END (REAR AIR CONDITIONING HARNESS IS FAULTY)