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Honda Odyssey 2004. Manual - part 523

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Seat Belt Tensioner

SRS Unit

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SRS

Precautions and Procedures (cont’d)

5. Remove the center pillar lower trim panel (see page

20-58). Disconnect both seat belt tensioner 2P
connectors (A) from the side wire harness 2P
connectors (B).

6. Remove the center lower pocket (see page 20-67).

Disconnect SRS unit connector A, and/or SRS unit
connector B from the SRS unit.

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DTC (Diagnostic Trouble Codes)

Reading the DTC (’99-02 Models)

Precautions

HDS

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General Troubleshooting Information

The self-diagnostic function of the SRS system allows it to locate the causes of system problems and then store this
information in memory. For easier troubleshooting, this data can be retrieved via a data link circuit.

• When you turn the ignition switch ON (II), the SRS indicator will come on. If it goes off after 6 seconds, the system is

normal.

• If there is an abnormality, the system locates and defines the problem, stores this information in memory, and turns

the SRS indicator on. The data will remain in the memory even when the ignition switch is turned off or if the battery
is disconnected.

• When you connect the HDS to the 16P data link connector (DLC) to short the SCS terminal, and turn the ignition

switch ON (II), the SRS indicator will indicate the diagnostic trouble code (DTC) by the number of blinks.

• When you connect the HDS to the 16P date link connector (DLC), you can retrieve the DTC in the Honda Systems

‘‘SRS’’ menu.

• After reading and recording the DTC, proceed with the troubleshooting procedure for this code.

• Use only a digital multimeter to check the system. If it’s not a Honda multimeter, make sure it’s output is 10 mA

(0.01A) or less when switched to the smallest value in the ohmmeter range. A tester with a higher output could
damage the airbag circuit or cause accidental airbag deployment and possible injury.

• Whenever the ignition switch is ON (II), or has been turned OFF for less than 3 minutes, be careful not to bump the

SRS unit; the airbags could accidentally deploy and cause damage or injuries.

• Before you remove the SRS harness, disconnect the driver’s airbag connector, the front passenger’s airbag

connector, both side airbag connectors, and both seat belt tensioner connectors.

• Make sure the battery is sufficiently charged. If the battery is dead or low, measuring values won’t be correct.
• Do not touch a tester probe to the terminals in the SRS unit or harness connectors, and do not connect the terminals

with a jumper wire. Use only the backprobe set and the HDS. Backprobe spring-loaded lock type connectors
correctly.

When the SRS indicator is on, read the DTC using either of the following methods:

Connect the HDS to the 16P Data Link Connector (DLC) (A).

(cont’d)

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∼

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HDS (retrieving the flash codes)

Patterns of DTC Indications

Reading the main code

Reading the subcode

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SRS

General Troubleshooting Information (cont’d)

Bulb check

Main code

Subcode

S: Second

OFF

6 S

3 S

2 S

3 S

Example:

Main code=

= 3

Main code=

= 12

OFF

0.1 S

1.2 S 1.2 S 1.2 S

1.2 S 1.2 S 1.2 S 1.2 S 1.2 S

OFF

Example:

Main code=

= 21

OFF

1.2 S

1.2 S 1.2 S

0.1 S

1.2 S

Example:

Subcode=

= 4

OFF

0.3 S

The SRS indicator (A) indicates the DTC by the number
of blinks when the HDS is connected to the DLC (data
link connector) (16P) (B).

1. Make sure the ignition switch is OFF.

2. Connect the HDS to the DLC (16P) (B), and follow

the Tester’s prompts in the ‘‘SCS’’ menu.

3. Make sure the SCS line is grounded, then turn the

ignition switch ON (II). The SRS indicator comes on
for about 6 seconds, and then goes off. Then it will
blink to indicate the DTCs.

4. Read the DTC.

5. Turn the ignition switch OFF, and wait for 10

seconds.

6. Disconnect the HDS from the DLC (16P) (B).

7. Proceed with the troubleshooting procedure for the

DTC.

The DTC consists of a main code and subcode.

In case of 11

Four fast blinks count as 10.
Add any further blinks together as shown.

Count the number of blinks.

In case of 1

In case of 20 or more
Two sets of four continuous blinks count as 20.
Add any further blinks together as shown.

If the main code is ’3’, and the subcode is ’4’, record a
DTC 3-4.

Count the number of blinks.

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Example of DTC Indications

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1. Continuous failure, SRS Indicator blinks like this:

2. Intermittent failure, SRS Indicator blinks like this:

OFF

Bulb check
period

Main code (2)

DTC 2-1
Most recent problem

Subcode (1)

Main code (1) Subcode(3)

DTC 1-3
Second-most recent
problem

DTC 1-1
Third-most recent
problem

Main code (1) Subcode (1)

Indications
are repeated
in case of
continuous
failure.

Indicator stays on in
case of intermittent failure.

S: Second

3 S

1.2 S 1.2 S

2 S

0.3 S

3 S

0.3 S

3. Normal (no failure), SRS Indicator blinks like this:

Bulb check
period

DTC 5-1

OFF

No DTC, system is normal, the indicator
stays on.

• Including the most recent problem, up to three different DTCs can be indicated.
• In case of a continuous failure, the DTC will be indicated repeatedly.
• In case of an intermittent failure, the SRS indicator will indicate the DTCs one time, then it will stay on.
• If both a continuous and an intermittent failure occur, both DTCs will be indicated as continuous failures.
• When the system is normal (no DTC), the SRS indicator will stay on.
• If the SRS indicator comes on continuously without a DTC, there may be a problem with the system.
• If the SRS indicator does not come on as indicated above, always check for an open or a short to ground in the SCS

circuit before troubleshooting the system.

(cont’d)

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