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Home / DTC / B1C48 — Flash switch to pass

B1C48 — Flash switch to pass

Detailed page for trouble code B1C48.

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Code

B1C48

LAND ROVER B — Body

Flash switch to pass

Brand: LAND ROVER
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty flash-to-pass switch (stalk/column switch)
  • Damaged wiring or chafed harness between switch and BCM/steering module
  • Corroded or loose connector at switch or module
  • Failed steering column module or body control module
  • Software/firmware error or communication fault on in-vehicle network (CAN)
  • Water ingress or contamination in switch or connector

Symptoms

  • Headlamp flash (flash-to-pass) does not operate or works intermittently
  • One or more warning/info messages on dash related to lighting or steering column switches
  • DTC B1C48 stored in vehicle control module memory
  • Possible simultaneous faults relating to steering column controls or CAN communication

What to check

  • Read and record all stored codes and freeze frame data with a suitable diagnostic scanner
  • Attempt to reproduce the fault by operating the flash-to-pass function and watching live data
  • Visually inspect the steering column switch, wiring, and connectors for damage or corrosion
  • Check relevant fuses and power/ground at the BCM and steering column module
  • Scan for related CAN or module communication errors

Signal parameters

  • Switch type: typically a momentary contact (ground or 12 V) or a steering-module-originated CAN message
  • Expected idle state: open/high impedance or defined voltage (vehicle battery voltage or near 0 V depending on design)
  • Active state: momentary change to the opposite state when the stalk is actuated (short to ground or to 12 V, or a CAN event)
  • Pulse duration: momentary (user-operated) – typically < 2 seconds per actuation

Diagnostic algorithm

  1. Connect a diagnostic scanner. Read/record B1C48 and any related codes; note freeze-frame and occurrence count.
  2. Attempt to operate flash-to-pass while observing live data for the switch input or steering column module status. Note whether the module sees the command.
  3. Inspect the steering column stalk, switch and connectors for physical damage, moisture or corrosion. Repair any obvious issues.
  4. With ignition ON, probe the switch connector (or module input) with a multimeter or oscilloscope while actuating the flash stalk. Confirm correct voltage change or signal behavior.
  5. Check continuity and resistance between the switch connector and the BCM/steering module input. Repair broken wires, chafed sections, or poor crimps.
  6. If the switch wiring and connectors test OK but no valid signal is present, check the steering column module power/ground and CAN communication. Repair as needed.
  7. If the steering column module is powered and communicating but does not report switch input, consider replacing or reflashing the steering column module per manufacturer procedures.
  8. After repairs, clear codes and verify the fault does not return under normal operation. Re-scan to ensure no related faults remain.

Likely causes

  • Intermittent open/short in switch wiring or connector
  • Mechanical failure of the flash-to-pass stalk switch
  • Corrosion at connector causing high resistance or intermittent contact
  • Faulty steering column module that is not reporting switch status

Fault status

⚠️ Status
Flash switch to pass – signal missing, stuck, or implausible; input to BCM/steering module failed validation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1C47 B1C49 B1A10 B1234
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

B1C48

MITSUBISHI B — Body

PS.pretensioner circuit high

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty flash-to-pass switch (stalk/column switch)
  • Damaged wiring or chafed harness between switch and BCM/steering module
  • Corroded or loose connector at switch or module
  • Failed steering column module or body control module
  • Software/firmware error or communication fault on in-vehicle network (CAN)
  • Water ingress or contamination in switch or connector

Symptoms

  • Headlamp flash (flash-to-pass) does not operate or works intermittently
  • One or more warning/info messages on dash related to lighting or steering column switches
  • DTC B1C48 stored in vehicle control module memory
  • Possible simultaneous faults relating to steering column controls or CAN communication

What to check

  • Read and record all stored codes and freeze frame data with a suitable diagnostic scanner
  • Attempt to reproduce the fault by operating the flash-to-pass function and watching live data
  • Visually inspect the steering column switch, wiring, and connectors for damage or corrosion
  • Check relevant fuses and power/ground at the BCM and steering column module
  • Scan for related CAN or module communication errors

Signal parameters

  • Switch type: typically a momentary contact (ground or 12 V) or a steering-module-originated CAN message
  • Expected idle state: open/high impedance or defined voltage (vehicle battery voltage or near 0 V depending on design)
  • Active state: momentary change to the opposite state when the stalk is actuated (short to ground or to 12 V, or a CAN event)
  • Pulse duration: momentary (user-operated) – typically < 2 seconds per actuation

Diagnostic algorithm

  1. Connect a diagnostic scanner. Read/record B1C48 and any related codes; note freeze-frame and occurrence count.
  2. Attempt to operate flash-to-pass while observing live data for the switch input or steering column module status. Note whether the module sees the command.
  3. Inspect the steering column stalk, switch and connectors for physical damage, moisture or corrosion. Repair any obvious issues.
  4. With ignition ON, probe the switch connector (or module input) with a multimeter or oscilloscope while actuating the flash stalk. Confirm correct voltage change or signal behavior.
  5. Check continuity and resistance between the switch connector and the BCM/steering module input. Repair broken wires, chafed sections, or poor crimps.
  6. If the switch wiring and connectors test OK but no valid signal is present, check the steering column module power/ground and CAN communication. Repair as needed.
  7. If the steering column module is powered and communicating but does not report switch input, consider replacing or reflashing the steering column module per manufacturer procedures.
  8. After repairs, clear codes and verify the fault does not return under normal operation. Re-scan to ensure no related faults remain.

Likely causes

  • Intermittent open/short in switch wiring or connector
  • Mechanical failure of the flash-to-pass stalk switch
  • Corrosion at connector causing high resistance or intermittent contact
  • Faulty steering column module that is not reporting switch status

Fault status

⚠️ Status
Flash switch to pass – signal missing, stuck, or implausible; input to BCM/steering module failed validation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1C47 B1C49 B1A10 B1234
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

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