238Section 4 Audio and Video System ReplacementI. Notice on operationPlease explain to the customer that the AM/FM broadcast channel information will be cleared when remov-
ing the battery negative terminal cable. Record the channel information before removing the negative termi-
nal cable if necessary. Reset after connecting the negative terminal cable.
yAll cassette tapes and CDs must be taken out before radio removal and installation.
yIf the cassette tapes and CDs can not be taken out due to radio fault. Do not take them out by force.
Drive the vehicle to Service Station.
yMake sure the grounding bolts are tightened before antenna removal and installation.
yThere will be noise when receiving electric wave if the grounding bolts are not tightened.
yDon't touch the speaker cone.Intermediate Multiple CD main unit Radio assemblyInstrument PanelMultiple DVD main unit
250(2) Trouble indication
1In case of a trouble, the warning light will indicate. If the external trouble is a history trouble, the indication
will be cancelled. When the history trouble happens for no less than 5 times, the indicator light will remain
on even if there is no more trouble. "Low battery voltage" shall not be counted in the total number of
troubles.
2Only a service worker can reset a displayed or history trouble. The internal troubles of a SRS ECU
(HAE2.5) or the "crash record" of a trouble cannot be reset, in which case the SRS ECU (HAE2.5) shall
be replaced.
(3) Microcontroller-independent warning light on
Microcontroller with definitive troubles cannot fulfill its functions, thus cannot control the warning light. In
this case, the warning light will light up through proper circuit regardless of the microcontroller as stated
below:
yMalfunction of the battery supplying power to SRS ECU (HAE2.5): the warning lights are turned
on continuously by means of the drive function of the selfcheck light.
yLoss of internal working voltage: the warning light remains on.
yReset due to trigger failure of the watchdog: the warning light blinks.
yMicrocontroller out of work: the warning light always lights up.
yIncomplete insertion of SRS ECU (HAE2.5) connector: the warning light remains on by means of
a shorting bar.
The diagnostic procedures can well be illustrated as follows:
If it is found that the SRS warning light remains on, follow the undermentioned procedures to check even if
the light goes out eventually. First, a scan meter is used to check the location of the trouble.
Then£¬go on with the checking in accordance with specific methods and procedures for the correspondent
location.
a. If the result indicates that it is an internal trouble or that the SRS is already detonated, replace the
ECU directly.
b. Troubleshooting.
