Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 477 (SUPPLEMENTAL RESTRAINT SYSTEM - DIAGNOSTICS)DTC B1653/35: SEAT POSITION SENSOR ASSEMBLY MALFUNCTIONINSPECTION PROCEDURE

2004 Toyota Matrix XR, FWD, Standard

Inspection Procedure

2004 Toyota Matrix XR, FWD, StandardSECTION Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag deployment.

Turn the ignition switch to the LOCK position.
Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
Disconnect the connectors from the airbag sensor assembly.
Disconnect the connectors from the horn button assembly.
Disconnect the connectors from the front passenger airbag assembly.
Disconnect the connector from the front seat airbag assembly LH.
Disconnect the connector from the front seat airbag assembly RH.
Disconnect the connector from the curtain shield airbag assembly LH.
Disconnect the connector from the curtain shield airbag assembly RH.
Disconnect the connector from the front seat outer belt assembly LH.
Disconnect the connector from the front seat outer belt assembly RH.

Check DTC.
PREPARATION:
1. Connect the connectors to the airbag sensor assembly.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
CHECK:
1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
2. Clear the DTCs stored in memory (see PRE-CHECK ).
3. Turn the ignition switch to the LOCK position.
4. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
5. Check the DTCs (see PRE-CHECK ).
  
  Fig 1: Checking DTC
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:

DTC B1653/35 is not output.

HINT:

Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.
1. NG: Go to step 2.
2. OK: The malfunctioning part can now be considered normal. To make sure of this, use simulation method to check.
Check connection of connectors
PREPARATION:
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.
CHECK:

Check that the connectors are properly connected to the airbag sensor assembly and seat position sensor assembly.

OK:

The connectors are connected.
1. NG: Connect connectors, then go to step 1 .
2. OK: Go to next step.

Check floor No. 1 wire (open).

PREPARATION:

Disconnect the connectors from the airbag sensor assembly and the seat position sensor assembly.

Using a service wire, connect terminals B10-6 and B10-5 of connector "C".

NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting.

CHECK:

Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (OPEN) CONDITIONS .

Fig 2: Checking Floor No.1 Wire (Open)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

IDENTIFYING FLOOR NO. 1 WIRE (OPEN) CONDITIONS

Tester connection	Condition	Specified Condition
C6-9 (DSP+) - C6-17 (DSP-)	Always	Below 1 Ω

NG: Repair or replace floor No. 1 wire.
OK: Go to next step.

Check floor No. 1 wire (short).

PREPARATION:

Disconnect the service wire from connector "C".

CHECK:

Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (SHORT) CONDITIONS .

Fig 3: Checking Floor No.1 Wire (Short)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

IDENTIFYING FLOOR NO. 1 WIRE (SHORT) CONDITIONS

Tester Connection	Condition	Specified Condition
C6-9 (DSP+) - C6-17 (DSP-)	Always	1 MΩ or higher

NG: Repair or replace floor No. 1 wire.
OK: Go to next step.

Check floor No. 1 wire (to B+).

PREPARATION:

Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

CHECK:

Measure the voltage according to IDENTIFYING FLOOR NO. 1 WIRE (TO B+) CONDITIONS .

Fig 4: Checking Floor No.1 Wire (To B+)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

IDENTIFYING FLOOR NO. 1 WIRE (TO B+) CONDITIONS

Tester Connection	Condition	Specified Condition
C6-9 (DSP+) - Body ground	Ignition switch ON	Below 1 V
C6-17 (DSP-) - Body ground	Ignition switch ON	Below 1 V

NG: Repair or replace floor No. 1 wire.
OK: Go to next step.

Check floor No. 1 wire (to ground).

PREPARATION:

Turn the ignition switch to the LOCK position.

Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

CHECK:

Measure the resistance according to IDENTIFYING FLOOR NO. 1 WIRE (TO GROUND) CONDITIONS .

Fig 5: Checking Floor No.1 Wire (To Ground)

OK:

IDENTIFYING FLOOR NO. 1 WIRE (TO GROUND) CONDITIONS

Tester Connection	Condition	Specified Condition
C6-9 (DSP+) - Body ground	Always	1 MΩ or higher
C6-17 (DSP-) - Body ground	Always	1 MΩ or higher

NG: Repair or replace floor No. 1 wire.
OK: Go to next step.

Check seat position sensor assembly.
PREPARATION:
1. Connect the connectors of the seat position sensor assembly and the airbag sensor assembly.
2. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
CHECK:
1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
2. Clear the DTCs stored in memory (see PRE-CHECK ).
3. Turn the ignition switch to the LOCK position.
4. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
5. Check the DTCs (see PRE-CHECK ).
  
  Fig 6: Checking Seat Position Sensor Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:

DTC B1653/35 is not output.

HINT:

Codes other that DTC B1653/35 may be output at this time, but they are not related to this check.
1. NG: Go to step 8.
2. OK: From results of above inspection, malfunctioning part can now be considered normal. To make sure of this, use simulation method to check.
Replace seat position sensor assembly.
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.
3. Replace the seat position sensor assembly (see AIR BAG RESTRAINT SYSTEMS ).
HINT:

Perform the inspection using parts from a normal vehicle when possible.
1. Go to Next step.
Check airbag sensor assembly.
PREPARATION:

Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

CHECK:
1. Turn the ignition switch to the ON position, and wait for at least 60 seconds.
2. Clear the DTCs stored in memory (see PRE-CHECK ).
3. Turn the ignition switch to the LOCK position.
4. Turn the ignition switch to the ON position, and wait for at least for 60 seconds.
5. Check the DTCs (see PRE-CHECK ).
  
  Fig 7: Checking Airbag Sensor Assembly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK:

DTC B1653/35 is not output.

HINT:

Codes other that DTC B1653/35 may be output at this time, but they are not related to this check.
1. NG: Replace airbag sensor assembly.
2. OK: END

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.