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Home / DTC / B1B73 — Local interconnection network bus 2 source circuit of food

B1B73 — Local interconnection network bus 2 source circuit of food

Detailed page for trouble code B1B73.

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22,491specific
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Code

B1B73

LAND ROVER B — Body

Local interconnection network bus 2 source circuit of food

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

Causes

  • Broken or disconnected LIN bus wiring or connector
  • Short to battery or short to ground on the LIN wiring
  • Faulty LIN master (host) or slave module driving LIN Bus 2
  • Poor or intermittent power/ground to modules on LIN Bus 2
  • Corroded or loose connectors at modules or junctions
  • Aftermarket equipment or modifications interfering with the bus

Symptoms

  • One or more body or comfort features inoperative (locks, mirrors, seats, HVAC, lights) depending on modules on LIN Bus 2
  • Communication faults or additional related DTCs (lost communication) present
  • Possible illumination of warning or message indicating a module fault
  • Intermittent operation of affected components or complete loss

What to check

  • Use a compatible diagnostic scan tool to read all stored and pending codes and note which modules show communication loss
  • Visually inspect wiring harnesses, connectors and junctions associated with LIN Bus 2 for damage, corrosion or disconnection
  • Verify vehicle battery voltage and good battery connections (typically 12–14 V) before further testing
  • Check power and ground circuits for modules on LIN Bus 2 for proper voltage and continuity
  • Measure LIN Bus 2 line voltage at a known-good pin with the ignition on—look for expected idle and dominant voltages
  • Perform wiggle tests on harnesses and connectors while observing bus voltage or scan tool communication

Signal parameters

  • LIN is a single-wire serial bus: idle (recessive) voltage approximately battery voltage (≈ 11–14 V)
  • Dominant (active) level driven by transceiver typically near 0 V during frame transmission
  • Data rate commonly up to 20 kbit/s (varies by implementation)
  • Expected low bus current; short-to-ground will pull bus to ~0 V, short-to-battery will hold bus high and prevent dominant pulses
  • Typical LIN transceiver uses a pull-up to battery and a driver to ground; open circuit results in no frames seen

Diagnostic algorithm

  1. Connect a diagnostic scan tool and read all codes. Record which modules report LIN Bus 2 communication issues.
  2. Clear codes, cycle ignition and see if B1B73 returns immediately or is intermittent to determine severity.
  3. Verify battery voltage and inspect fuses/relays supplying suspected LIN master and related modules.
  4. Identify wiring harnesses, connectors and modules attached to LIN Bus 2 per vehicle wiring diagram. Perform a visual inspection for damage or corrosion.
  5. With ignition on, measure LIN Bus 2 voltage at the connector pin: expect near-battery voltage at idle; check for short to ground (near 0 V) or hard short to battery (stuck high).
  6. Perform continuity checks between modules and central junction for the LIN conductor; backprobe connectors if needed. Check for high resistance or opens.
  7. If intermittent, perform wiggle test while monitoring bus activity with a scan tool or oscilloscope to find movement-related faults.
  8. Use an oscilloscope to capture LIN frames and verify correct recessive/dominant transitions and timing. Compare to known-good waveform if available.
  9. Isolate sections of the bus if necessary—disconnect suspected slave modules one at a time (with safe procedures) to see if fault clears, indicating a faulty node.
  10. Repair wiring or connectors as required. If a module is confirmed faulty, replace per manufacturer procedure and reprogram/reinitialize if required.
  11. After repair, clear codes and confirm restoration of communication and normal operation over a suitable road or function test.

Likely causes

  • Damaged or chafed harness on LIN Bus 2 causing intermittent contact
  • Failed LIN transceiver in the module that serves as the bus source
  • Connector pins contaminated with corrosion or bent causing high resistance
  • Short circuit to accessory power aftermarket accessory tied into the bus
  • Blown fuse or open supply feeding the LIN master or related module

Fault status

⚠️ Status
LIN Bus 2 source circuit fault detected — communication on the Local Interconnect Network (LIN) Bus 2 is abnormal (open/short/high resistance).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

B1B70 B1B71 B1B72 U0100 U0101 U1110
306

Browse 306 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

B1B73

MITSUBISHI B — Body

Side impact sensor(LH) 2

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

Causes

  • Broken or disconnected LIN bus wiring or connector
  • Short to battery or short to ground on the LIN wiring
  • Faulty LIN master (host) or slave module driving LIN Bus 2
  • Poor or intermittent power/ground to modules on LIN Bus 2
  • Corroded or loose connectors at modules or junctions
  • Aftermarket equipment or modifications interfering with the bus

Symptoms

  • One or more body or comfort features inoperative (locks, mirrors, seats, HVAC, lights) depending on modules on LIN Bus 2
  • Communication faults or additional related DTCs (lost communication) present
  • Possible illumination of warning or message indicating a module fault
  • Intermittent operation of affected components or complete loss

What to check

  • Use a compatible diagnostic scan tool to read all stored and pending codes and note which modules show communication loss
  • Visually inspect wiring harnesses, connectors and junctions associated with LIN Bus 2 for damage, corrosion or disconnection
  • Verify vehicle battery voltage and good battery connections (typically 12–14 V) before further testing
  • Check power and ground circuits for modules on LIN Bus 2 for proper voltage and continuity
  • Measure LIN Bus 2 line voltage at a known-good pin with the ignition on—look for expected idle and dominant voltages
  • Perform wiggle tests on harnesses and connectors while observing bus voltage or scan tool communication

Signal parameters

  • LIN is a single-wire serial bus: idle (recessive) voltage approximately battery voltage (≈ 11–14 V)
  • Dominant (active) level driven by transceiver typically near 0 V during frame transmission
  • Data rate commonly up to 20 kbit/s (varies by implementation)
  • Expected low bus current; short-to-ground will pull bus to ~0 V, short-to-battery will hold bus high and prevent dominant pulses
  • Typical LIN transceiver uses a pull-up to battery and a driver to ground; open circuit results in no frames seen

Diagnostic algorithm

  1. Connect a diagnostic scan tool and read all codes. Record which modules report LIN Bus 2 communication issues.
  2. Clear codes, cycle ignition and see if B1B73 returns immediately or is intermittent to determine severity.
  3. Verify battery voltage and inspect fuses/relays supplying suspected LIN master and related modules.
  4. Identify wiring harnesses, connectors and modules attached to LIN Bus 2 per vehicle wiring diagram. Perform a visual inspection for damage or corrosion.
  5. With ignition on, measure LIN Bus 2 voltage at the connector pin: expect near-battery voltage at idle; check for short to ground (near 0 V) or hard short to battery (stuck high).
  6. Perform continuity checks between modules and central junction for the LIN conductor; backprobe connectors if needed. Check for high resistance or opens.
  7. If intermittent, perform wiggle test while monitoring bus activity with a scan tool or oscilloscope to find movement-related faults.
  8. Use an oscilloscope to capture LIN frames and verify correct recessive/dominant transitions and timing. Compare to known-good waveform if available.
  9. Isolate sections of the bus if necessary—disconnect suspected slave modules one at a time (with safe procedures) to see if fault clears, indicating a faulty node.
  10. Repair wiring or connectors as required. If a module is confirmed faulty, replace per manufacturer procedure and reprogram/reinitialize if required.
  11. After repair, clear codes and confirm restoration of communication and normal operation over a suitable road or function test.

Likely causes

  • Damaged or chafed harness on LIN Bus 2 causing intermittent contact
  • Failed LIN transceiver in the module that serves as the bus source
  • Connector pins contaminated with corrosion or bent causing high resistance
  • Short circuit to accessory power aftermarket accessory tied into the bus
  • Blown fuse or open supply feeding the LIN master or related module

Fault status

⚠️ Status
LIN Bus 2 source circuit fault detected — communication on the Local Interconnect Network (LIN) Bus 2 is abnormal (open/short/high resistance).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

B1B70 B1B71 B1B72 U0100 U0101 U1110
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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