93B5

What the Code Means

Code 93B5 points to high resistance in the front passenger seat belt pyrotechnic charge circuit. The electrical circuit between the SRS (airbag) control module and the pyrotechnic charge has elevated resistance, which can prevent the tensioner from firing in a crash. Causes include damaged wiring, corroded contacts in the connector, or a faulty pyrotechnic charge itself.

Symptoms

• Airbag (SRS) warning light on in the instrument cluster
• The passenger seat belt pyrotechnic charge may fail to fire in a collision

Diagnosis and Repair

Step 1: Check the Wiring and Connector

Inspect the wire harness running to the pyrotechnic charge under the passenger seat for damage, kinks, or corrosion. Check that the contacts in the connector are intact.

Step 2: Repair or Replace the Pyrotechnic Charge

If the wiring is good, remove the seat belt pyrotechnic charge. The unit can be sent to MyAirbags for rebuild. After the repair, reinstall the pyrotechnic charge.

Step 3: Clear the Code

Once the fault is fixed, clear the error code with diagnostic equipment (ISTA, INPA, or an SRS-capable scanner).

Secondary Damage

Ignoring code 93B5 can leave the passenger seat belt pyrotechnic charge unfired in a crash. That raises the risk of injury to the front passenger, since the belt won't tension in time to hold the body in place. In a serious collision, the consequences can be severe.