Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / B1499 — Control unit collision decision

B1499 — Control unit collision decision

Detailed page for trouble code B1499.

33,912codes
59brands
11,451generic
22,461specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

B1499

MITSUBISHI B — Body

Control unit collision decision

Brand: MITSUBISHI
Type: B — Body
Views: UK: 24 EN: 23 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty airbag/SRS control unit (ECU) internal fault
  • Damaged or shorted wiring harness to impact/acceleration sensors
  • Failed impact/occupant sensors (accelerometers, pressure sensors)
  • Poor or corroded connectors and grounds at SRS module or sensors
  • Low or unstable supply voltage to the SRS control unit
  • Water ingress or physical damage to module or sensors

Symptoms

  • SRS/Airbag warning lamp illuminated or flashing
  • Airbag system disabled (diagnostic protects deployment)
  • Seatbelt pretensioners may be disabled or fault-indicated
  • Related safety restraint features may not function
  • Possible stored freeze-frame data showing unusual sensor values

What to check

  • Read and record all stored SRS/airbag and network codes with a capable scan tool
  • Check freeze-frame and history to see when and under what conditions the code set
  • Verify battery voltage at rest and while cranking; ensure charging system healthy
  • Visually inspect SRS control module and impact sensor connectors and harness for damage, corrosion, or water ingress
  • Check for other related DTCs (sensors, power/ground, communications)
  • Follow manufacturer procedure to disable SRS before performing continuity or connector work

Signal parameters

  • SRS control unit supply voltage (V)
  • SRS control unit ground integrity (ohms)
  • Impact sensor output (voltage or mV/g) per manufacturer specification
  • Sensor loop resistance (ohms) for occupant/impact sensors
  • Airbag ECU internal self-test status/decision flag
  • CAN/SWC communication status with ABS/ECU if applicable

Diagnostic algorithm

  1. With a capable SRS scan tool read all DTCs and freeze-frame; note related codes and timestamp
  2. Confirm and record battery voltage and charging system condition
  3. Inspect visually: SRS control unit, sensor mounting points, connectors and wiring for damage or corrosion
  4. Follow manufacturer SRS disable procedure before any hands-on work (disable battery, wait specified time, use grounding procedures if required)
  5. Check power and ground at the SRS control unit connectors for correct voltage and low resistance ground
  6. Using wiring diagrams, perform continuity/resistance checks on impact sensor circuits and connector pins; compare to spec
  7. If sensor outputs are available, measure impact sensor signals (voltage/responsiveness) per service manual; perform an oscilloscope test if needed
  8. If wiring and sensors test good, consider module self-test failure: check for internal faults or crash-record flag; consult OEM service literature for module reset/replacement criteria
  9. After repairs clear codes and perform required SRS system initialization or calibration using OEM scan tool; verify no new codes and confirm SRS lamp extinguishes
  10. If module replacement is required, follow OEM pairing/programming and disposal procedures for crash-detected modules

Likely causes

  • Intermittent or open/shorted sensor circuit to the airbag control unit
  • Loss of vehicle battery supply or weak battery while code set
  • Corroded connector at the SRS module or an impact sensor
  • Module self-test failure due to internal electronic fault
  • Previous collision event left the module in a crashed/locked state

Fault status

⚠️ Status
Airbag control unit — collision decision malfunction (SRS collision decision fault)
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B1498 B1500 B1600 B1620 B0100
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .