Section 01-20B: Restraints, Passive—Supplemental Air Bag System
1993 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Location of Air Bag System Components

  1. LH Primary Front Crash Sensor—Behind LH headlamp
  1. RH Primary Front Crash Sensor—Behind RH headlamp
  1. LH B-pillar Safing Sensor—LH B-pillar behind trim panel
  1. Center Front Primary Sensor—Center radiator support
  1. Driver Air Bag—Steering wheel
  1. Clockspring—Behind steering wheel
  1. Diagnostic Monitor—In center console behind climate controls


Electrical Schematic—Air Bag System






System Connectors






PIN NO. CIRCUIT/COLOR DESCRIPTION
1 640 (R/Y) Power Input
2 57 (BK) Ground
3 57 (BK) Ground
4 608 (BK/Y) Air Bag Indicator Control
5 57 (BK) Ground
6 640 (R/Y) Power Input
7 57 (BK) Ground
8 — NOT USED
9 — NOT USED
10 615 (GY/W) Steering Column Air Bag Return
11 614 (GY/O) Steering Column Air Bag Feed Monitor
12 623 (P/W) Safing Sensor Output Monitor
13 937 (R/W) Battery Input
14 — NOT USED
15 611 (W/O) Safing Sensor Feed
16 613 (DB/W) Safing Sensor Ground Monitor
17 617 (PK/O) Right Forward Primary Sensor Feed
18 619 (PK/W) Center Forward Primary Sensor Feed
19 621 (W/Y) Left Forward Primary Sensor Feed
20 618 (P/LG) Right Forward Primary Sensor Ground Monitor
21 620 (P/LB) Center Forward Primary Sensor Ground Monitor
22 622 (T/BK) Left Forward Primary Sensor Ground Monitor
23 612 (P/O) Safing Sensor Feed Monitor
24 — Not Used



AIR BAG DIAGNOSTIC MONITOR TYPICAL PIN VOLTAGES WITH SYSTEM
CONNECTED AND ENGINE RUNNING
Vehicle Charging System Voltage Pin No. 1 Pin No. 2 Pin No. 3 Pin No. 4 Pin No. 5 Pin No. 6 Pin No. 7 Pin No. 8
9.0 9.0 0.0 0.0 9.0 0.0 9.0 * 1.9
9.5 9.5 0.0 0.0 9.5 0.0 9.5 * 2.0
10.0 10.0 0.0 0.0 10.0 0.0 10.0 * 2.1
10.5 10.5 0.0 0.0 10.5 0.0 10.5 * 2.2
11.0 11.0 0.0 0.0 11.0 0.0 11.0 * 2.3
11.5 11.5 0.0 0.0 11.5 0.0 11.5 * 2.4
12.0 12.0 0.0 0.0 12.0 0.0 12.0 * 2.5
12.5 12.5 0.0 0.0 12.5 0.0 12.5 * 2.6
13.0 13.0 0.0 0.0 13.0 0.0 13.0 * 2.7
13.5 13.5 0.0 0.0 13.5 0.0 13.5 * 2.8
14.0 14.0 0.0 0.0 14.0 0.0 14.0 * 2.9
14.5 14.5 0.0 0.0 14.5 0.0 14.5 * 3.0
15.0 15.0 0.0 0.0 15.0 0.0 15.0 * 3.1
15.5 15.5 0.0 0.0 15.5 0.0 15.5 * 3.2
16.0 16.0 0.0 0.0 16.0 0.0 16.0 * 3.3
* Vehicles with passenger bag: 5.0 volts
   Vehicles without passenger bag: 0.0 volts


Vehicle Charging System Voltage Pin No. 9 Pin No. 10 Pin No. 11 Pin No. 12 Pin No. 13 Pin No. 14 Pin No. 15 Pin No. 16
9.0 + 1.9 1.9 1.9 9.0 NC 14.5 0.0
9.5 + 2.0 2.0 2.0 9.5 NC 14.9 0.0
10.0 + 2.1 2.1 2.1 10.0 NC 15.4 0.0
10.5 + 2.2 2.2 2.2 10.5 NC 15.9 0.0
11.0 + 2.3 2.3 2.3 11.0 NC 16.4 0.0
11.5 + 2.4 2.4 2.4 11.5 NC 16.8 0.0
12.0 + 2.5 2.5 2.5 12.0 NC 17.3 0.0
12.5 + 2.6 2.6 2.6 12.5 NC 17.3 0.0
13.0 + 2.7 2.7 2.7 13.0 NC 17.3 0.0
13.5 + 2.8 2.7 2.7 13.5 NC 17.5 0.0
14.0 + 2.9 2.9 2.9 14.0 NC 17.5 0.0
14.5 + 3.0 3.0 3.0 14.5 NC 17.7 0.0
15.0 + 3.1 3.1 3.1 15.0 NC 17.8 0.0
15.5 + 3.2 3.2 3.2 15.5 NC 18.0 0.0
16.0 + 3.3 3.3 3.3 16.0 NC 18.2 0.0
+ Vehicles with passenger bag: Same as Pin 8
   Vehicles without passenger bag: 0.0 volts
NC No harness Connection


Vehicle Charging System Voltage Pin No. 17 Pin No. 18 Pin No. 19 Pin No. 20 Pin No. 21 Pin No. 22 Pin No. 23 Pin No. 24
9.0 1.4 1.4 1.4 0.0 0.0 0.0 14.5 NC
9.5 1.5 1.5 1.5 0.0 0.0 0.0 14.9 NC
10.0 1.6 1.6 1.6 0.0 0.0 0.0 15.4 NC
10.5 1.7 1.7 1.7 0.0 0.0 0.0 15.9 NC
11.0 1.8 1.8 1.8 0.0 0.0 0.0 16.4 NC
11.5 1.9 1.9 1.9 0.0 0.0 0.0 16.8 NC
12.0 2.0 2.0 2.0 0.0 0.0 0.0 17.3 NC
12.5 2.1 2.1 2.1 0.0 0.0 0.0 17.3 NC
13.0 2.2 2.2 2.2 0.0 0.0 0.0 17.3 NC
13.5 2.3 2.3 2.3 0.0 0.0 0.0 17.5 NC
14.0 2.4 2.4 2.4 0.0 0.0 0.0 17.5 NC
14.5 2.5 2.5 2.5 0.0 0.0 0.0 17.7 NC
15.0 2.6 2.6 2.6 0.0 0.0 0.0 17.8 NC
15.5 2.7 2.7 2.7 0.0 0.0 0.0 18.0 NC
16.0 2.8 2.8 2.8 0.0 0.0 0.0 18.2 NC
NC No harness Connection


Diagnostic Trouble Code Table
AIR BAG DIAGNOSTIC MONITOR DIAGNOSTIC TROUBLE CODE PRIORITY TABLE
PRIORITY CODE COMPONENT/FAULT DESCRIPTION
Highest — No Air Bag Indicator—Inoperative Lamp Circuit or No Ignition Voltage to Diagnostic Monitor
— Continuous Air Bag Indicator—Diagnostic Monitor Disconnected or Inoperative  
12 Low Battery Voltage  
13 Air Bag Circuit or Sensor Circuits Shorted to Ground  
21 Safing Sensor Not Mounted to Vehicle Properly  
22 Safing Sensor Output Circuit Shorted to Battery Voltage  
23 Safing Sensor Input Feed/Return Circuit Open  
24 Safing Sensor Output Feed/Return Circuit Open or Low Resistance in a Primary Crash Sensor  
32 Driver Side Air Bag Circuit High Resistance or Open  
33 Pin 7 Not Grounded  
34 Driver Side Air Bag Circuit Low Resistance or Shorted  
35 Pins 8 and 9 Shorted Together  
41 Primary Crash Sensor Circuit High Resistance or Open  
44 RH Headlamp Primary Crash Sensor—Not Mounted to Vehicle Properly  
45 Center Radiator Primary Crash Sensor—Not Mounted to Vehicle Properly  
46 LH Headlamp Primary Crash Sensor—Not Mounted to Vehicle Properly  
51 Diagnostic Monitor Internal Thermal Fuse Blown and Short to Ground No Longer Exists  
52 Back-up Power Supply Voltage Boost Fault  
53 Internal Diagnostic Monitor Fault  
Lowest — Rapid Continuous Flashing of Air Bag Indicator, All Primary Crash Sensors Disconnected