Refer to continuous DTCs recorded in step 1 . If any continuous DTCs were retrieved, go to diagnostic
trouble code identification table for direction to appropriate test. See DIAGNOSTIC TROUBLE CODE
(DTC) IDENTIFICATION table. If no continuous DTCs were retrieved, reconnect system. Activate air
bag system. See ACTIVATING SYSTEM under DISABLING & ACTIVATING AIR BAG SYSTEM.
Clear all DTCs. See CLEARING FAULT CODES under DIAGNOSTICS.
TEST N: PASSENGER AIR BAG DEACTIVATION (PAD) WARNING LIGHT SHORT TO
BATTERY (DTC B1890)
Description
Restraints Control Module (RCM) has ability to deactivate passenger-side air bag under certain conditions.
When passenger-side air bag is deactivated, PAD switch warning light will be illuminated.
RCM monitors PAD switch warning light for short to battery conditions. If RCM detects a short to battery in
PAD switch warning light circuit, it will store Diagnostic Trouble Code (DTC) B1890 in memory and flash
Code 27 on AIR BAG warning light.
Possible Causes
A short to battery in PAD switch warning light circuit could be caused by an short to battery in Brown wire,
damaged or inoperative PAD switch or damaged or inoperative RCM.
1. Check for hard or intermittent DTC
Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). See USING
SCAN TOOL under DIAGNOSTICS. Turn ignition switch to RUN position. Retrieve and record any
continuous DTCs. See RETRIEVING FAULT CODES under DIAGNOSTICS. Perform on-demand
self-test. See ON-DEMAND SELF-TEST under DIAGNOSTICS. If DTC B1890 was retrieved during
on-demand self-test, fault is hard. Go to next step. If DTC B1890 was not retrieved, fault is intermittent.
Go to step 4 .
2. Check PAD switch warning light
Place PAD switch in OFF position. If PAD warning light illuminates properly, replace RCM. Go to step
5 . If PAD warning light does not illuminate properly, go to next step.
3. Check circuit for short to battery
Turn ignition switch to OFF position. Disable air bag system. See DISABLING SYSTEM under
DISABLING & ACTIVATING AIR BAG SYSTEM. Access RCM and disconnect harness connector.
See RESTRAINTS CONTROL MODULE (RCM) under REMOVAL & INSTALLATION. Access
PAD switch and disconnect connector. See PASSENGER-SIDE AIR BAG DEACTIVATE SWITCH
(PAD) under REMOVAL & INSTALLATION. Turn ignition switch to RUN position. Measure voltage
NOTE:
Before proceeding, see AIR BAG SAFETY PRECAUTIONS .
2003 Ford Pickup F150
2003 ACCESSORIES/SAFETY EQUIPMENT Air Bag Restraint Systems - F150 Pickup