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Home › Cadillac › 1992 › Allante F7/ME9 › Repair and Diagnosis (Single Page) › Accessories & Equipment › Anti-Theft Systems › Anti-Theft System › System Tests › Personal Automotive Security System › Test B: PASSKey(R) Decoder Module

Test B: PASSKey(R) Decoder Module

Measure voltage at PASSKey(R) decoder module connector (disconnected). See PASSKEY(R) DECODER MODULE (TEST 1)  table.

PASSKEY(R) DECODER MODULE (TEST 1)

Condition Measure Between (1) Correct Voltage
Ignition Switch To RUN A1 (RED/BLK) & Ground (2) Battery
Ignition Switch To RUN B 8 (RED/YEL) & Ground (3) Battery
Ignition Switch To RUN B 8 (RED/YEL) & B1 (BLK) (4) Battery
Ignition Switch To RUN A2 (BLU) & B1 (BLK) (5) 5
Ignition Switch To START A3 (BLK) & B1 (BLK) (6) Battery
(1) If results are correct, measure resistance at pass key decoder module connector (disconnected). See PASSKEY(R) DECODER MODULE (TEST 2)  table.
(2) Check the RED/BLK (439) wire and Fuse 14 for an open.
(3) Check the RED/YEL (2) wire and Fuse 4 in Maxi fuse block for an open.
(4) Check the BLK (1033) wire for an open.
(5) Check the BLU (229) wires for an open, or a short to battery or ground.
(6) Check BLK (625) wire for an open. If wire is good, see Test C  .
PASSKEY(R) DECODER MODULE (TEST 2)

Condition Measure Between (1) Correct Resistance
No Key In Ignition Switch A6 (PPL) & Ground (2) Open Circuit
No Key In Ignition Switch A6 (PPL) & B2 (PPL/WHT) (3) Open Circuit
Key In Ignition Switch A6 (PPL) & B2 (PPL/WHT) (4) In The Range Of 380 To 12.3K Ohms
(1) If resistance is correct but engine will not crank, replace the PASSKey(R) decoder module.
(2) Check PPL (1073) wire for a short to ground. The short may be in the steering column.
(3) Check PPL (1073) and PPL/WHT (1074) wires for shorts between the two wires. The short may be in the steering column.
(4) Check PPL (1073) and PPL/WHT (1074) wires for an open.
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