B1919

Code

Other B — Body

Air Bag Memory Clear Circuit Short To Battery

Brand: Other

Type: B — Body

Views: UK: 16 EN: 33 RU: 32

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Damaged or pinched wiring harness (insulation worn through) contacting battery positive
Corroded, bridged or damaged connector making unintended contact with battery +
Shorted splice or aftermarket accessory tied into the SRS memory-clear circuit
Faulty SRS (airbag) control module internal short
Improper repair or modification near SRS harnesses
Poorly seated or damaged terminal in connector

Symptoms

SRS / airbag warning lamp illuminated on instrument panel
Inability to clear SRS fault codes or memory using a scan tool
Intermittent SRS warnings if contact is intermittent
Possible loss of SRS system functionality until repaired

What to check

Read SRS DTCs and freeze frame data with a capable scan tool; confirm B1919 presence and any related codes
Inspect SRS-related connectors and wiring harnesses visually for damage, pinch points, chafing, or aftermarket splices
Check for signs of corrosion, bent pins, or foreign material in connectors
Measure voltage at the memory-clear circuit connector pin with respect to ground (back-probe while following safety procedures)
Perform resistance/continuity checks between the memory-clear circuit and battery positive and between circuit and SRS module with battery disconnected
Inspect recent repairs or accessories added near SRS wiring

Signal parameters

Battery nominal voltage: 12.0–14.5 V (engine off/on as applicable)
Fault condition (short to battery): memory-clear circuit reads approximately battery voltage (~12 V) when it should be open or low
Normal/inactive memory-clear circuit: open/high resistance to battery positive or voltage near 0 V depending on OEM design
Short to battery resistance: low resistance to battery positive (typically 10 kΩ)
Connector continuity to SRS module should be low (short harness) when expected, but should not have continuity to battery positive when module removed

Diagnostic algorithm

Safety first: Disable vehicle electrical system and SRS according to the manufacturer procedure (disconnect negative battery terminal and wait the OEM-specified time before touching SRS components). Use proper electrostatic and handling precautions for SRS components.
Use a scan tool to confirm B1919 is current and note any additional SRS codes. Record freeze frame data.
Visually inspect SRS wiring harnesses routed near the dash, center console, and front of vehicle for chafing, pinching, or obvious damage. Pay attention to areas where harness passes through metal edges or near aftermarket equipment.
Inspect all SRS-related connectors (including those at the SRS control module) for corrosion, bent pins, or signs of heat. Disconnect and reseat connectors; check terminal condition.
With battery reconnected and following safe procedures, back-probe the memory-clear circuit connector and measure voltage relative to ground. If battery voltage is present when it should not be, confirm short to battery.
With battery disconnected, perform resistance checks from the memory-clear circuit to battery positive and to chassis ground to locate unintended continuity. Wiggle harness while checking to reproduce intermittent shorts.
Isolate sections of the harness by disconnecting intermediate connectors/splices and by disconnecting the SRS control module to determine whether the short is in the harness or inside the module. After disconnecting the module, check for continuity to battery positive from the harness side—if present, harness short; if absent, suspect module.
Repair identified damage: repair or replace wiring, clean or replace connectors, and correct any improper splices or aftermarket wiring. Replace SRS control module only if diagnostics indicate an internal short after harness checks.
After repairs, clear DTCs with a scan tool and perform a system check. Verify B1919 does not return and that the SRS system reports normal status.
Document repairs and advise customer of any related safety work performed.

Likely causes

Chafed wiring harness contacting a vehicle positive feed
Connector corrosion or bent terminal causing contact with battery power
Faulty/shorted SRS control module

Fault status

⚠️ Status

B1919 — Air Bag Memory Clear Circuit Short To Battery: The SRS control unit detects battery positive on the memory-clear circuit when it should not. Inspect wiring, connectors and control module for short to battery.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-1.5 hours