Prove Out Procedure
Turn the ignition switch from the OFF to the ON position and visually monitor the air bag indicator with all SRS components connected or restraint system diagnostic tools installed. The air bag indicator will light continuously for approximately 6 seconds and then turn off. If an SRS fault is present, the air bag indicator will:
- fail to light.
- remain lit continuously.
- flash.
The flashing might not occur until approximately 30 seconds after the ignition switch has been turned from the OFF to the ON position. This is the time required for the RCM to complete the testing of the SRS. If the air bag indicator is inoperative and an SRS fault exists, a chime will sound in a pattern of 5 sets of 5 beeps. If this occurs, the air bag indicator will need to be repaired before diagnosis can continue.
Diagnosing Customer Concerns Without Hard DTCs
If a lamp fault code (LFC) is reported by the customer but is not present when the vehicle comes in for service, follow the Diagnostic Instruction procedures in this section to identify the intermittent diagnostic trouble code (DTC).
Once the DTC is known, read the Normal Operation section of the pinpoint test for the DTC involved.
- Follow the deactivation or depowering procedure as directed in this section.
- Determine the location of components involved in creating the DTC.
- Carry out a thorough visual inspection of:
- components.
- connectors.
- splices and wiring harnesses.
- insulation on conductors.
Refer to the Possible Causes section of the pinpoint test for the DTC involved, which lists the common concerns that relate to the DTC. Concerns are listed according to priority.
Diagnosing Customer Concerns with Hard DTCs
Most supplemental restraint system (SRS) diagnostic procedures will require deactivation and reactivation or depowering and repowering of the system. Deactivation and reactivation requires the disconnection of most SRS components and the installation of restraint system diagnostic tools. Depowering and repowering requires disconnection of the battery and removal of the restraints control module (RCM) fuse. This reduces the risk of inadvertent deployment of SRS components while diagnostic procedures are being carried out.
Restraint system diagnostic tools are required for the diagnosis and testing of the SRS. It is not acceptable to short-circuit the air bag module connections with a jumper wire. If a jumper wire is used to short-circuit the air bag module connections, a LFC will be displayed.
You need more then a code read too see these DTC'S . Your need a factory or some other professional type scan tool .
- If no DTCs related to the concern are retrieved, GO to Symptom Chart .
Restraints Control Module (RCM) Diagnostic Trouble Code (DTC) Priority Table
DTC a
LFC b
Fault Priority
Description
Action To Take
-
Continuous
1
RCM Disconnected or Inoperative, Loss of Battery Feed, or Loss of Signal Ground
Go To Pinpoint Test A .
B1231
19
3
RCM Crash Data Memory Full
INSTALL a new RCM.
B1318
-
-
Battery Voltage Low
CHECK battery voltage; to be above 9.0 volts. REFER to Section 414-00 .
B1342
24
2
RCM is Faulted
INSTALL a new RCM.
B1869
NONE
Secondary air bag warning sounds if another fault is present
19
Lamp Air Bag Warning Indicator Circuit Open
Go To Pinpoint Test B .
B1870
NONE
Secondary air bag warning sounds if another fault is present
20
Lamp Air Bag Warning Indicator Circuit Short to Battery
Go To Pinpoint Test C .
B1871
25
14
Passenger Air Bag Deactivation (PAD) Switch Fault
Go To Pinpoint Test D .
B1877
46
-
Driver Pretensioner Circuit Resistance High
Go To Pinpoint Test E .
B1878
17
-
Driver Pretensioner Circuit Short to Voltage
Go To Pinpoint Test F .
B1879
17
-
Driver Pretensioner Circuit Short to Ground
Go To Pinpoint Test G .
B1881
47
-
Passenger Pretensioner Circuit Resistance High
Go To Pinpoint Test H .
B1882
18
-
Passenger Pretensioner Circuit Short to Voltage
Go To Pinpoint Test I .
B1883
18
-
Passenger Pretensioner Circuit Shorted to Ground
Go To Pinpoint Test J .
B1884
27
15
Passenger Air Bag Deactivation (PAD) Warning Lamp Inoperative
Go To Pinpoint Test K .
B1885
46
-
Driver Pretensioner Circuit Resistance Low
Go To Pinpoint Test E .
B1886
47
-
Passenger Pretensioner Circuit Resistance Low
Go To Pinpoint Test H .
B1887
15
6
Driver Air Bag Circuit Shorted to Ground
Go To Pinpoint Test L .
B1888
16
8
Passenger Air Bag Circuit Shorted to Ground
Go To Pinpoint Test M .
B1890
27
16
Passenger Air Bag Deactivation (PAD) Warning Lamp Short to Battery
Go To Pinpoint Test N .
B1891
-
18
Air Bag Tone Warning Indicator Circuit Short to Battery or Ignition
Go To Pinpoint Test O .
B1892
-
17
Air Bag Tone Warning Indicator Circuit Shorted to Ground or Open
Go To Pinpoint Test P .
B1916
15
7
Driver Air Bag Circuit Shorted to Battery or Ignition
Go To Pinpoint Test Q .
B1921
21
4
RCM Bracket Ground Resistance High
Go To Pinpoint Test R .
B1925
16
9
Passenger Air Bag Circuit Shorted to Battery or Ignition
Go To Pinpoint Test S .
B1932
32
10
Driver Air Bag Circuit Resistance High
Go To Pinpoint Test T .
B1933
33
11
Passenger Air Bag Circuit Resistance High
Go To Pinpoint Test U .
B1934
34
12
Driver Air Bag Circuit Resistance Low
Go To Pinpoint Test V .
B1935
35
13
Passenger Air Bag Circuit Resistance Low
Go To Pinpoint Test W .
C1414
15
5
Incorrect Vehicle Identification
Go To Pinpoint Test X .
B2477
Flashing 5Hz
-
Module Configuration Fault
INSTALL a new RCM.
Symptom Chart
Condition
Possible Sources
Action
- Air bag warning indicator is illuminated continuously
- Fuse
- Circuitry
- RCM
- Shorting bar or camming beam in connector
- Instrument cluster
- Air bag indicator flashing
- REFER to DTC Priority Table.
- Audible tone - DTCs retrieved
- Go To Pinpoint Test Q .
- Go To Pinpoint Test R .
- No communication with the restraints control module (RCM)
- Fuse
- Diagnostic tool
- Data link connector (DLC)
- RCM
- Circuitry
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