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Home / DTC / B1204 — PS.ABG indicator circuit low

B1204 — PS.ABG indicator circuit low

Detailed page for trouble code B1204.

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Code

B1204

MITSUBISHI B — Body

PS.ABG indicator circuit low

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

Causes

  • Blown or open fuse supplying the indicator circuit
  • Open, corroded, or shorted wiring/connectors between the control module and the indicator
  • Poor or intermittent ground at the instrument cluster or control module
  • Faulty indicator lamp or LED assembly (burned out or internal failure)
  • Faulty instrument cluster or control module driver output
  • Water intrusion or corrosion in connector terminals

Symptoms

  • PS.ABG warning indicator lamp illuminated, dim, flickering, or not functioning
  • Related system status/warnings displayed in combination with the lamp
  • Possible loss of function or system disabled depending on vehicle logic
  • Other electrical gremlins in dash cluster (intermittent indicators)
  • DTC B1204 stored and may prevent readiness or disable features

What to check

  • Use a diagnostic scanner to read and record all stored DTCs and freeze frame data
  • Visually inspect fuses and replace any blown fuse in the indicator circuit
  • Visually inspect wiring and connectors to the instrument cluster and related modules for corrosion, damage, or water intrusion
  • Backprobe the indicator connector and measure voltage and ground with key ON to verify supply and driver signal
  • Check continuity and resistance of wiring between the instrument cluster and the controlling module
  • Wiggle harnesses while observing indicator/scan data to identify intermittent faults

Signal parameters

  • Supply voltage to indicator circuit: nominal battery voltage (~11–14.5 V) with ignition ON
  • Indicator driver output (expected): toggles between ~0 V (low) and battery voltage when active; a steady low (
  • Circuit low fault threshold: signal stuck near 0 V or significantly below expected voltage (manufacturer-specific)
  • Ground integrity: near 0 Ω to chassis ground; higher resistance suggests poor ground

Diagnostic algorithm

  1. Connect an OBD-II scanner and record all codes and any related modules’ status. Note if B1204 is the only code.
  2. Inspect fuses and replace any blown fuse in the instrument/indicator circuits. Retest for code persistence.
  3. Visually inspect the instrument cluster connector, wiring harness, and related module connectors for corrosion, bent pins, water damage, or loose connections. Repair as needed.
  4. With ignition ON, backprobe the indicator supply and ground pins at the cluster; verify battery voltage on supply and good chassis ground.
  5. Backprobe the indicator driver/signal pin while commanding the indicator (if supported) or cycling ignition; confirm driver toggles as expected. If signal is always low, suspect open/short or driver fault.
  6. Perform continuity and short-to-power/short-to-ground checks between the cluster and the controlling module. Repair any open or shorted sections.
  7. If wiring and connectors test good, bench-test or replace the indicator lamp/LED or instrument cluster. Recheck after replacement.
  8. If indicator still reports low and cluster/lamp good, inspect and test the controlling module output. Replace or repair module if confirmed faulty.
  9. Clear DTCs, perform function test and verify proper operation. Road test if necessary and re-scan for reappearance of the code.

Likely causes

  • Blown fuse or fusible link for indicator circuit
  • Loose or corroded connector at the instrument cluster or vehicle control module
  • Open or short in the harness near connectors (pin damage, chafing)
  • Failed indicator lamp/LED in the dash cluster
  • Faulty body control module or instrument cluster driver stage

Fault status

⚠️ Status
Stored when the PS.ABG indicator circuit voltage is detected below the expected threshold (low circuit) indicating a wiring, connector, lamp, or driver fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1201 B1202 B1205 B1210 B1250
406

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

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