Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1710

9J1–51

RESTRAINT CONTROL SYSTEM

DTC 61  Warning Lamp Circuit Failure

D09R100002

Circuit Description:

When the ignition switch is turned “ON”, battery voltage is
applied to the “AIR BAG” warning  lamp and to the
“ignition 1” input terminal “12”.  The Sensing and
Diagnostic Module (SDM) responds by flashing the “AIR
BAG”  warning lamp seven times.  The SDM monitors the
lamp driver output by comparing the output  state at
“Supplemental Restraint System (SRS) warning lamp”
terminal “7” to the microprocessor commanded state.
When  “ignition 1” is in the specified value, and the output
state Does not match the commanded  state of the lamp
driver for 500 milliseconds, DTC 61 is set.

DTC Will Set When:

“Ignition 1” voltage is in the specified value and the output
state at the “SRS warning lamp”  terminal does not match

the commanded state of the lamp driver for 500
milliseconds.  This  test is run every 100 milliseconds
during “Continuous Monitoring” tests and once per each
ignition cycle at the beginning.

Action Taken:

SDM attempts to turn “ON” the “AIR BAG” warning lamp
and sets a diagnostic trouble code.

DTC Will Clear When:

The ignition switch is turned “OFF.”

Diagnostic Aids:

Refer to 

Charts B and C to diagnose warning lamp circuit

malfunctions.

RESTRAINT CONTROL SYSTEM

9J1–52

DTC 61 Warning Lamp Circuit Failure

Step

Action

Yes

No

1

Was the “SRS Diagnostic System Check” performed?

Go to 

Step 2

Go to 

“SRS

Diagnostic

System Check.”

2

1. Malfunctions within the “AIR BAG” warning lamp circuitry will

set this diagnostic trouble code.

2. These malfunctions are addressed in the “SRS Diagnostic

System Check” via Chart B and Chart C.

3. Failure to properly perform the “SRS Diagnostic System

Check” may result in misdiagnosis.

4. Ignition switch “ON.”
5. Clear SRS diagnostic trouble codes.

Is DTC 61 SET?

Ignition switch

“OFF.”

Go to 

Chart A

Repeat the “SRS

Diagnostic

System Check.”

9J1–53

RESTRAINT CONTROL SYSTEM

DTC 71  Internal SDM Fault

D09R100002

Circuit Description:

Diagnostic Trouble Code (DTC) 71 is an indication of a
potential internal Sensing and Diagnostic Module (SDM)
malfunction and will set if any of the  following conditions
are detected:
1) Deployment or microprocessor energy reserve failure.
2) Electronically Erasable Programmable Read Only
Memory failure. (EEPROM).
3) Random Only Memory failure. (ROM).
4) Random Access Memory failure. (RAM).
5) Calibration check sum failure.
6) Deployment switch faults.
7) Accelerometer fault.
8) Arming sensor fault.
9) Diagnostic current faults.
10) DTC 19
11) DTC 25
12) DTC 51

13) DTC 53

DTC Will Set When:

Any of the above indicated malfunctions are detected by
the SDM. The malfunctions described above are tested
mainly during “Continuous Monitoring” and the remaining
at every ignition cycle.

Action Taken:

SDM turns “ON” the “AIR BAG” warning lamp and sets a
diagnostic trouble code.

DTC Will Clear When:

A scan tool “Clear Codes” commanded is received by the
SDM.  Some of the indicated  malfunctions will only allow
the “AIR BAG” warning lamp to go out.
But when DTC 19, 25, 51, 53 are also set, SDM is
Replaced.

RESTRAINT CONTROL SYSTEM

9J1–54

DTC 71 Internal SDM Fault

WARNING: DURING SERVICE PROCEDURES. BE
VERY CAREFUL WHEN HANDLING A SENSING AND
DIAGNOSTIC MODULE (SDM). NEVER STRIKE OR
JAR THE SDM. NEVER POWER UP THE SRS IF THE
SDM IS NOT PROPERLY INSTALLED ON THE
VEHICLE. ALL SDM AND MOUNTING BRACKET
FASTENERS MUST BE CAREFULLY TORQUED AND
THE ARROW MUST BE POINTING TOWARD THE
FRONT OF THE VEHICLE TO ENSURE PROPER
OPERATION OF THE SRS. THE SDM IF NOT
PROPERLY INSTALLED ON THE VEHICLE MAY
DEPLOY THE AIRBAG (WHICH MAY CAUSE
PERSONAL INJURY) IN CASE OF AN ACCIDENTAL
POWER UP TO THE SRS.

CAUTION: When Diagnostic Trouble Code (DTC) 19
or 25 or 51 or 53 has been set it is necessary to
Replace the SDM. Setting DTC 19 and 25 or 51 or 53
will also cause DTC 71 to set. When a scan tool
“CLEAR CODES” command is issued and the
malfunction is no longer present, DTC 51 or 53 and
DTC 71 will remain current. Ensure that the short to
voltage condition DTC 19, 25 is repaired prior to
installing a Replacement SDM to avoid damaging the
SDM.

Step

Action

Yes

No

1

Was the “SRS Diagnostic System Check” performed?

Go to 

Step 2

Go to 

“SRS

Diagnostic

System Check.”

2

Note SRS “Diagnostic System Check.”
Is DTC 19 or 25 or 51 or 53 also set (current or history)? (Refer to
notice above).

Go to 

DTC 19 if

DTC 19 is set

Go to 

DTC 25 if

DTC 25 is set

Go to 

DTC 51 if

DTC 51 is set

Go to 

DTC 53 if

DTC 53 is set

Ignition switch

“OFF.”

Replace SDM.

Repeat the “SRS

Diagnostic

System Check.”