7.5.3: Troubleshooting Central Locking System ------------------------ (by Jim Conforti:jec@us.dynix.com) (Editors note: This pertains to mid-80s -> early 90s cars) Start with doors unlocked and all windows open NOTE: NEVER CONNECT OR DISCONNECT THE CONTROL UNIT UNLESS BATTERY POWER IS REMOVED!! Operation Response Action 1. DDL to lock All doors lock Goto OP #2 Some doors Lock R/R suspect Door Lock Motor

ckt. No doors Lock Goto OP #4 2. DDL to deadbolt All doors double

lock Goto OP #3

Drivers and SOME others dbl lock

R/R suspect Door Lock Motor

Drivers ONLY dbl locks

Perform TEST B

Drivers does NOT dbl lock

Mechanical Problem

3. DDL to unlock All doors unlock Goto OP #4 Some doors unlock R/R suspect Door Lock Motor

ckt. No doors unlock Goto OP #5 4. PDL to lock All doors lock If doors did not lock in OP

#1 R/R DD lock switch else Goto OP #5

Some doors lock R/R suspect Door Lock Motor ckt

No doors lock If doors locked in OP #1 R/R PD microswitch if doors did not lock in OP #1 perform TEST A

5. PDL to lock All doors unlock If doors did not unlock in

OP #3 R/R DD lock switch else Goto OP #6

Some doors unlock R/R suspect Door Lock Motor No doors unlock If doors unlocked in OP #3

R/R PD Lock Switch if doors did not unlock in OP #3 perform TEST C

6. Get in car, close/lock all

Doors remain locked Goto OP #7 doors, IGN to RUN

Doors Unlock R/R Central Locking control unit

7. Get out, DDL to lock

All doors can be unlocked

Goto OP #8 Unlock each door by All doors remain secure Disconnect connector from control unit and check pulling up button for short to ground at terminal #11 if short, find it!, if not R/R Control Unit

8. Trunk lock to Trunk Locks Goto OP #9

LOCK Trunk does not lock If doors lock, R/R Trunk

lock motor and/or circuit If doors do not lock R/R Trunck lock switch R/R Control Unit if switch and circuit are OK

9. Trunk lock to UNLOCK

Trunk unlocks Goto OP #10

Trunk does not unlock

If doors unlock, R/R Trunk lock motor and/or circuit If doors do not unlock, R/R Trunk lock switch R/R Control Unit if switch and circuit are OK

10.Turn key back to LOCK

Gas filler locks Goto OP #11

Gas filler does not lock

R/R Gas Filler Motor ckt.

11.Turn key to unlock

Gas filler unlocks Done, No faults!

Gas filler does not unlock

R/R Gas Filler Motor ckt.

TEST A. Measure Voltage at Control Unit Connector w/ Control Unit Connected Term 3 and Ground should be battery, else check wire to Term 3 for open Term 3 & 4 should be battery, else check wire from Term 4 for open to ground Jumper between Term 7 and ground, if doors lock R/R switches and related wiring else ... Disc. battery, remove Control Unit and reconnect Batt. jumper 1 & 3 together, now jumper 2 & 4 together if doors lock, R/R Control unit, else check wires on Term. 1 & 3 for opens (see schematic) TEST B. With Conrol Unit connected, jumper between 10 & ground doors should double lock, if not, check wires to Term. 11 for opens and R/R Control Unit if no opens found. If doors DO double lock, check wires to Term 10 for open and R/R Unlock Inhibit Switch if wire OK. TEST C With Control Unit connected, Jumper 6 & ground. If doors unlock, R/R switches and related wiring (see schematic) if doors do NOT unlock R/R Control Unit